Public green space quantity and distribution in Cairo, Egypt

Green spaces are recognised as an important contributor in enhancing the quality of urban life. Many cities are now working on preserving and increasing their green spaces as a part of their sustainable development plans. Unfortunately, green spaces in Cairo are currently being marginalised and the city has been losing significant quantities of its already limited green spaces in favour of other developmental projects. This article analyses the quantities and distribution of existing green spaces in Cairo using official numerical data. The results show recent changes that happened between the years 2017 and 2020. The focus is on public green spaces: amenity green spaces between residential blocks, street green spaces, plant nurseries under public management and public parks. Finally, the trend of disappearing green spaces in Cairo is discussed. The discussion extends the comparison to include data from the years 2000 and 2006 to demonstrate the rapid changes happening in Cairo that are altering the city and affecting many of its residents. The problem of lack of data about green spaces is also examined in the discussion. Documenting green spaces areas and distribution in Cairo is important because no recent published data are available for decision-makers, researchers and planners. Data is also scattered between different sources because of the division of management responsibilities between different public agencies. A larger-scale project is required to accurately survey all green spaces in Cairo and create a comprehensive publicly accessible geographical database that documents all their types, quantities and distribution.


Introduction
The city of Cairo, in over a thousand years, had grown vastly in area, from around 7 km 2 when founded as al-Fustat [23], to 840 km 2 [27]. It has the highest number of inhabitants in Egypt-around 9.9 million-which represents 10% of the Egyptian population [11]. It had gone through major transformations that gradually changed its urban character. Nowadays, Cairo is still subjected to rapid changes and both formal and informal development. The old urban core is still growing and attracting more population while new communities are expanding towards its desert boundaries with new districts and satellite cities. Through the process of urbanisation, Cairo has been losing large areas of its agricultural lands, in addition to the growth of informal settlements with poor living conditions. The city suffers many problems, like traffic congestion, poor air quality, water pollution and inefficient waste management [7,22,27]. Along with these problems, Cairo also lacks the presence of sufficient green spaces that can mitigate these problems and decrease their harmful effects.
This article assesses the current situation regarding the provision of green spaces and public parks in Cairo. The goal is to highlight the critical position the city is currently at regarding the presence of sufficient quantities and adequate distribution of green spaces by providing recent numerical data that overcome the limitation in the currently available sources. The "Methods" section explains the scope of the study, the types of green spaces included and the process of data acquisition. Types of green spaces the study includes are amenity green spaces between residential blocks, street green spaces, plant nurseries under public management and public parks. It also focuses only on green spaces and public parks in Cairo's districts and does not include new communities.
Afterwards, the results compare the most recent changes, during the years 2017 and 2020, in the provision of green spaces in Cairo as a whole and in its districts. They also show the existing public parks in the city, their areas and distribution. Finally, the discussion follows the green spaces changes that happened over the years, extending to the years 2000 and 2006, reaching the current critical state of low presence and poor distribution of green spaces over the city. The trend of disappearing green spaces is discussed within the urban development approach that has been followed recently in Cairo. The negative effects of losing green spaces in Cairo are also highlighted. The discussion also examines the problems related to the lack and fragmentation of Cairo's green spaces data.

Research scope: Green spaces in Cairo
Cairo City is divided into 4 main regions (Southern, Western, Northern and Eastern) which consist of 37 districts. At the periphery of the southern and eastern regions, there are 4 new communities. The districts and new communities lie under different administrative jurisdictions, but together they form the boundaries of Cairo Governorate. This research focuses on public green spaces in the 37 districts of Cairo City (Fig. 1).
Urban green spaces are vegetated open spaces in cities that can be either public or private ( [15,26], p. 282 and 778 [16,18];). Cairo has several types of public green spaces that differ in areas, features and use. The city does not have an official classification for all its green areas except for the classification adopted by Cairo Cleanliness and Beautification Agency (CCBA) which covers only the green spaces they manage. According to CCBA data, the agency divides green spaces into six categories: 1) public parks, 2) main axes green spaces, 3) self-efforts green spaces, 4) nurseries, 5) Distinctive Gardens (DG) and 6) Specialised Gardens (SG) ( Table 1).
Green spaces categories adopted by CCBA are different from the common categories found in literature. For example, as the main feature of CCBA public parks, is being free, green space in a residential block or a green strip along a street are included. They do not separate between amenity green spaces and linear green spaces along streets except for major streets. DG and SG are the public parks in Cairo as they are green spaces used mainly for recreation [26]. However, they do not have free access and CCBA does not categorise them as public parks. Public parks, including DG, SG and other major public parks in Cairo, are one of the green space types that are included within this study in more detail.
Cairo also has other types of public and private green spaces. For example, private clubs and youth clubs often include some green areas. Institutional buildings like schools, universities, museums and other public buildings may also have green areas. These types of green spaces can contribute to providing several benefits to the city, but they have not been included in this study for two reasons: the limited public accessibility of some of these green spaces and the lack of comprehensive data that covers all of them as the responsibility of their management is divided between several authorities. Accordingly, this research covers only standalone types of green spaces and those that are part of a street or a square.

Data acquisition
To analyse the current situation in Cairo regarding its green spaces, three data types were required: (1) areas of green spaces in different districts, (2) population number at each of them and (3) shapefile for the administrative boundaries of Cairo and the division of its districts. The shapefile was acquired from the "Transport for Egypt Project" and modified to be integrated with the other data types. Population data and green spaces areas for 2020 were linked geographically in ArcMap with the shapefiles of the districts to create a database for green spaces in Cairo. They were used to calculate the 2020 individual share of green spaces in Cairo and in each of its districts which were also added to the database. Finally, points were created for public parks locations in Cairo. The data were used to create maps using ArcMap, besides representing them in tables and graphs. Detailed tables and additional information about data acquisition are included as Supplementary materials. For population data, the research depended on the data published by the CAMPAS [12] for the year 2017, and for 2020, the Cairo Governorate Portal [10] was used. On the other hand, finding accurate data about areas of green spaces in Cairo can be difficult. The data available from previous research are outdated and GIS mapping for green spaces in Cairo is not available online. To achieve comprehensive data within the current limited availability, the research synthesised areas of green spaces from various sources for the years 2017 and 2020.
First of all, because CCBA manages most of the City's green spaces, the agency was contacted to provide the data for the green spaces' areas. Excel files were obtained with areas of green spaces in each district in Cairo for the years 2017 and 2020. These data covered the types of green space that were presented in Table 1 except for the SG. Secondly, other agencies were contacted for some missing data for the similar types of green spaces: (1) the SG Administration: for the SG areas, and (2) al-Nasr Company: for additional residential amenity/incidental green spaces that they still manage and are not handed over to CCBA in two districts, al-Moqattam and al-Basatin. Finally, areas of well-known public parks, which are not managed by either CCBA or the SG Administration, were also added from internet sources or calculated using ArcMap. These major parks included: the Cultural Park for Children (CPC) [1], al-Fustat Park 1 and Arab al-Mohamady Park 2 [5] (which are managed by CCBA and were yet not included in their data), al-Azhar park [2], Merryland Park [14], al-Zohriya Park (Cairo [9]), the Aquarium Grotto Park [25], the Child Centre of Civilization and Creativity (CCCC), al-Maadi Island, al-Helmiya, Badr, al-Andalusiya and Panorama October parks 3 .

Modified data from previous research
The most recent data that were mentioned in the previous part needed to be compared in the discussion with data from previous years to show the changes that happened in Cairo. Data were found for the years 2000 and 2006 from previous research. However, these data could not have been discussed directly and some modifications were required to allow more consistency in the comparison. The boundaries of Cairo for all the years are the same but the internal divisions of the districts have some changes. Some districts that were previously merged and managed as one, have been divided into two separate districts. Besides presenting the data according to the most recent divisions, green spaces areas, population number and the individual share of green spaces were recalculated for the merged districts to allow a consistent comparison between the 4 years.
For the year 2006, a master thesis by Assem Shaban 4 (2009) included a study of green spaces' areas in Cairo. His research also depended on data from CCBA. The excel file Shaban originally acquired was requested, and he sent it by email. The table in the excel file included areas for green spaces in each district in Cairo divided into CCBA categories but including also youth centres and sports clubs, and green spaces inside governmental buildings. A sum was calculated for each district to be used in this research but excluding youth centres and sports clubs, and green spaces inside governmental buildings as these types are not within the scope of this research as mentioned earlier. Population data for the year 2006 were available from CAPMAS [13].
For the year 2000, al-Zafarany [4] article was used as a source for data but some modifications were needed also for consistency. The article categorised green spaces as recreational areas which indicated that the total areas might not include only green spaces. That was confirmed when the data were revised in detail and green spaces' areas in some districts were shown to have a high value when compared to the year 1 Area was calculated using ArcMap because official sources mention a much bigger area for the park which by examining the satellite images and after visiting the park was found to be significantly less than that mentioned area. 2 At the beginning of 2021, Arab al-Mohamdy park and the SG, al-Waily, were handed over to Ain Shams University after an administrative decision that the two parks belong to the Faculty of Medicine Campus. 3 Areas were calculated using ArcMap because there were not any data available online for the areas of these parks. 4 The data in his thesis included a different boundary for Cairo with fewer districts which would have made any comparison inaccurate, so it was better to get the original data and recalculate the values to unify the boundaries and the number of districts. 2006. Al-Zafarany data were also originally from CCBA which is expected to have the same format as the data from the year 2006. It was concluded that youth centres and sports clubs were part of the recreational areas he calculated. Accordingly, the youth centres and sports clubs areas in the 2006 data were subtracted from the totals of each district mentioned by al-Zafarany [4]. The establishment dates of the youth centres and sports clubs were revised using the Ministry of Youth and Sports website to ensure that there were not any new centres or clubs between the two dates. The population data used by al-Zafarany were used after correcting a minor mistake in the population number of al-Moqattam and al-Khalifa districts.

Results
Green spaces provision and distribution in Cairo

Public park provision, distribution and area categories in Cairo
Fifty-four public parks have been identified in Cairo that have dedicated management and offer active recreation 7 . The distribution of these parks is not equal between Cairo's districts (Fig. 5). Many districts that do not have green spaces in general also do not have public parks, while some of them have more of the other types of amenity green spaces and private clubs but fewer public parks. Al-Nozha District, for example, has one of the highest quantities of green spaces in Cairo, but it only has the Child  Centre of Civilization and Creativity (CCCC) which is partially a park but mainly a museum for children. Similarly, Heliopolis only has Merryland Park which is currently closed.
Gharb al-Qahira has the highest number of public parks and also the highest individual share of green spaces in Cairo. It has 8 parks, 7 of which are at al-Zamalek Island. In general, most of Cairo's public parks are divided between its southern and eastern regions with 18 and 16 parks respectively. However, 5 out of 11 districts in the southern region and 3 districts out of the 9 districts of the eastern region do not have any   Cairo kept losing green spaces without any major new additions. The resultant overall trend is a decrease in the total area of green spaces and an increase in population number which together led to the decrease in the individual share of green spaces (Fig. 7). Over the years and even in the highest recorded estimations, Cairo has always had an individual share of green spaces far less than the international recommended standards, for example, 9 m 2 /individual as suggested by the World Health Organization [21]. It is even less than the minimum local standards for existing cities as suggested by the National Organization for Urban Harmony (NOUH) which are 7 m 2 /individual and 5 m 2 /individual for the Nile Valley cities and desert cities respectively [28] 9 .
Also, disparities between districts did not change over the years showing that no efforts or interventions were made to enhance the situation. Districts with the lowest and highest individual share of green spaces remained almost the same. However, some districts with the highest individual share lost a significant amount of their green spaces. In Heliopolis, the individual share of green spaces dropped from its highest in 2006 (6.38 m 2 ) to 3.52 m 2 in 2020. Heliopolis Heritage Initiative documented the loss of green spaces with an estimation of 390,000 m 2 of lost green spaces between different streets and squares in the district [19]. Official data from CCBA shows a different value for lost green spaces, 272,274 m 2 between the years 2017 and 2020, which is still a significant loss that contributed to the individual share of green spaces losing around twofifths of its value. East Nasr City also had its highest individual share in 2006 (4.89 m 2 ) which declined in 2020 to be 1.69 m 2 . East Nasr City also lost 311,283 m 2 of its green spaces between 2017 and 2020 lowering the individual share of green spaces by 25%.
Unequal distribution is found in public parks too despite reopening some closed CCBA green spaces to be used as public parks (the DG category which added 16 public parks to Cairo over the years). The standards published by the NOUH mention that each district should have a district park of at least 21,000 m 2 and that each resident should access a public green space of at least 12,600 m 2 within 1 km from their homes. The uneven distribution of green spaces and public parks around the city does not allow such access for most of Cairo's residents. Also, 16 districts out of 37 in Cairo have no public parks and the area of 27 out of 54 its parks is less than 21,000 m 2 .
Despite the obvious lack of green spaces in Cairo, the existing ones with their limited areas are often under threat. That is because green spaces have always been the first victim of urbanisation and infrastructure projects. Projects to widen roads or build vehicle bridges are given priority over protecting green spaces. Examples of these projects were the construction of the 6th of October bridge, al-Azhar tunnel and widening of Ramses Street. Also, green spaces can often be sacrificed easily to build new service and administrative buildings like the loss in areas in al-Azbakiya, and al-Zohryia Parks [3,5], and other green spaces in Cairo (Fig. 8). Giving priority to other projects over green spaces indicates a lack of awareness of their importance and the harmful impact that would result from removing them. More recently, this practice has continued and major road infrastructure projects have been established in Cairo destroying many of its green spaces especially in Heliopolis and Nasr City as mentioned earlier (Figs. 9, 10 and 11).
Losing green spaces can have major harmful effects on any district and the wellbeing of its residents. A general decline in the quality of life in Heliopolis district, for example, was reported due to the loss of green spaces. Environmental and visual quality has declined which is worsened by bridges always interrupting visual continuity, the quality of sidewalks has decreased and crossing the roads for pedestrians became less safe [8]. A significant increase in traffic accidents was recorded shortly after those developments. Sidewalks also lost shade which is an important factor for walkability due to the cutting and uprooting of trees [6].
Infrastructure projects currently dominate the scene in Cairo and keep finding their way to more of its districts. New projects have been recently announced at al-Nozha and al-Maadi districts that are expected to change the fabric of another two districts known for their green spaces. Social media users frequently document the actual or intentional destruction of green spaces and the cutting of trees in different streets in Cairo. Recent images showed, for example, partial demolitions and construction work being carried out at several parks and nurseries. The final status of these interventions is still not known but if they went through, Cairo would lose at least an additional 124,236 m 2 : 91,920 m 2 at al-Waily district alone (around half the district's green spaces and total area of Arab al-Mohamdy and al-Waily parks that were handed over from CCBA to Ain Shams University to be part of its Faculty of Medicine campus), additional 23,100 m 2 at Heliopolis (area of Heliopolis CCBA Nursery) and 9,216 m 2 at Ain Shams (area of Gesr al-Suez Park and one of only two public parks in the district). This is in addition to other green spaces and trees that are expected to be lost at al-Maadi and al-Nozha. Green spaces and public parks under governmental management also suffer from serious deterioration in quality and heavy commercialisation. Cairenes' access to green spaces and public parks keeps diminishing with the increase in the cost of using public parks (rise in ticket prices and additional costs for activities inside most parks) and the closure of other amenity green spaces and public parks (Figs. 12 and 13). Green spaces are often closed to protect them from being heavily used. Responsible administrations claim that people's behaviour in green spaces will make them deteriorate rapidly and that they do not have sufficient resources to mitigate the damage. In fact, most of these closed green spaces end up in worse conditions. Public parks that do not bring reasonable revenue or in districts where residents are known to cause some problems when using the parks are sometimes decided to be closed or end up being neglected. Moreover, many of Cairo's public parks were managed originally with a minimum entrance fee to allow lower-income groups to use them. However, prices kept being raised because of the economic and social shifts in Egypt and the significant increase in services costs in general. According to al-Messiri [3], in 2004, most SG tickets were 1 Egyptian Pound. Seven out of the 23 SG at the time had a ticket half this value because they were located in lower-income districts. The Aquarium Grotto and al-Fustat Park tickets were even cheaper; ¼ a Pound. Currently, the ticket price of the SG is 10 Egyptian Pounds, and the DG, al-Fustat Park and the Aquarium Grotto entrance tickets cost 5 Egyptian Pounds. These parks are the cheapest in the city where the cost of a ticket for other parks can reach between 15 to 40 Egyptian Pounds. Not only did tickets prices rise significantly, but also activities that require additional costs kept increasing and became the main focus of the management. Cairo needs to restore the proper role of green spaces and public parks and stop their continuous loss. An improved public and urban life requires the integration of public green spaces into the experience of any city. Increasing the number of existing green spaces and achieving a better distribution throughout the city would reduce the pressure on existing spaces and facilitate access to spaces closer to more residents. Enhancing management and maintenance practices in existing green spaces and public parks would improve their quality and encourage more people to use them.

Lack and fragmentation of data
Accurate and comprehensive data that document and categorise existing green spaces are important in supporting planning and decision-making to effectively manage and develop green spaces [17]. Cairo lacks the support of an accurate publicly accessible geographical database for all its green spaces areas, locations and categorisation. CCBA does not have a clear methodology in creating its database. They do not follow up on yearly changes and take decisions accordingly. Their data also lack a coding for each green space and its exact location. For any improvement of the current situation in Cairo, they need to start determining more accurately the green spaces in each district which will allow better decision-making regarding the required resources, priorities for intervention and goals for preserving and increasing green spaces. Having accurate data can also help communicate the problems they face and also follow-up on achievements or failures in enhancing the quantity of green spaces in each district annually. CCBA, which is connected to Cairo Governorate, manages most of the green spaces in Cairo with branches in each of the city's districts. It also manages a number of parks through its DG Administration. The responsibility for managing other public parks and types of green spaces lies under several other agencies and administrations. With this fragmentation of management responsibilities, Cairo's green spaces and public parks do not have a proper classification that reflects their features. They are classified based on their management authority like SG and DG. The only common factor between most of these parks is their administration, but they differ in their areas and characteristics.
As a result, green spaces and public parks in Cairo are often isolated from one another and from other functions. They are not managed as a connected network which undermines their abilities to provide different benefits [17]. Integration between parks is not found between those under the same management let alone between parks managed by different administrations or between governmental agencies. Different public entities prefer to define the boundaries of their territories and separate their land uses from others. So, in Cairo's parks fences are found to separate uses that can be integrated which prevents visual continuity and connectivity between uses. The fragmentation of even adjacent parks led to having a larger number of parks that are often confined in areas and crowded with activities. For example, at al-Zamalek Island, despite the close proximity of its parks, they are managed individually, and each requires a separate entrance ticket (Fig. 14). Al-Tyfl and 6th of October Parks contain libraries that are surrounded inside the parks by their own fences. Libraries and other public uses, like metro stations, are found also next to some DG but without any connectivity to the parks. Rod al-Farrag Park is separated from the Culture Centre of Rod al-Farrag which is a remarkable building that used to be a part of the old market that the park replaced. Al-Manyal Park is next to Mohammed Aly Palace and gardens, and they are separated by high walls. Similarly, al-Qasr Park is separated from a nearby building that could be renovated and integrated with the park use (Fig. 15). Moreover, the areas of the parks, if Swanwick et al.'s [26] classification is followed, do not also capture the actual use of the parks, their scale of effect or catchment. DG and SG often have small parks that are better suited to be a public square or a residential green space. Other parks have wider catchments beyond their area category. These parks attract users from outside the districts either because of a distinctive feature or location, for example, the Aquarium Grotto, um-Kulthum and al-Fonon. Accordingly, a better classification is required that would include all public parks in Cairo. Finally, dealing with existing data requires close examination in order not to be misled by their interpretation. Kafafy [20] argues that official estimations for green spaces' areas and individual share can be misleading and are not completely reflected in direct benefits to people living in Cairo. Areas that are calculated in these reports include areas inaccessible to the public, undeveloped green spaces, in addition to services and parking areas attached to green spaces [20].
For example, in 2008, Cairo governorate [9] published a report, in collaboration with CCBA, about green spaces in Cairo. The report included an estimation of 1.82 m 2 /individual for the year 2007. It also claimed that the individual share in 1997 was 1.2 m 2 . However, these numbers are not accurately representing the existing green spaces in Cairo. The individual share the report mentioned for 1997 is similar to the original individual share in 2000 mentioned by al-Zafarany [4] indicating that it included youth centres and sports clubs. If compared with the individual share in 2006, it is unlikely that it increased from 1.18 to 1.82 m 2 in one year. Also, Shaban [24] showed that the individual Cairenes' share of green spaces was 1.5 m 2 in 2006. This value is divided between parks and green spaces, 0.6 10 m 2 /individual, and public clubs and youth centres 0.8 m 2 /individual. This shows how adding areas of youth centres and sports clubs changes the data significantly.
Examining the boundaries any data represent is important as it could provide misinformation as well. The changes in the administrative boundaries of Cairo's districts shift the individual share of green spaces significantly and disparities happen between two adjacent areas that were considered formally as one district. For example, al-Maadi has one of the highest individual shares of green spaces in Cairo while Tora is amongst the lowest. In the early 2000s, they used to be one district. If their share is to be calculated together for the year 2020, al-Maadi and Tora will have 1.53 m 2 /individual, while each of them separately has an individual share of 5.27 and 0.09 respectively. Similarly, in Gharb al-Qahira that has the highest individual share in 2020 (10.04 m 2 ), its individual share would drop to 3.66 m 2 if calculated with Boulaq that has 0.28 m 2 /individual.

Conclusions
For several years, the urban fabric and character of Cairo have significantly changed. Green spaces have often been the easiest to be sacrificed and replaced with other functions. This article documented the quantities and distribution of green spaces and public parks in Cairo trying to shed the light at the critical situation the city currently faces. Over the years, the quantity and distribution of green spaces and public parks in Cairo have not complied with the national or international standards. In addition, Cairo has lost significant quantities of green spaces in the past few years and the quality of others has seriously deteriorated. Green spaces and public parks in Cairo are managed