By Kenneth Marcos 
Early in the morning, along busy roads and quiet neighborhood corners in San Juan City, small patches of green quietly stand between buildings, sidewalks, and traffic. These trees, gardens, and planted islands may seem simple, but they play a vital role in keeping cities healthier and more livable.
To better understand and protect these green areas, the Department of Environment and Natural Resources–National Capital Region (DENR-NCR) has begun its 2026 ground validation of urban greenspaces in selected areas of San Juan City.
The activity is being carried out by the Production Forest Management Section under the Conservation and Development Division of DENR-NCR. Ground validation is an important process where environmental teams visit actual locations to confirm information first identified through satellite images and mapping technology.
By checking the sites on the ground, experts can verify the real condition, size, and type of greenspaces present in the city. This process helps ensure that environmental data is accurate and reliable.
Based on the initial validation in San Juan City, a total of 28 sites were identified as urban greenspaces, covering an estimated 88.33 hectares. These areas include both public and private spaces that contribute to the city’s greenery.
Among the identified greenspaces are planted sidewalks, center islands along roads, small parks, and pocket gardens. While these spaces may appear small individually, together they form an important part of the urban ecosystem.
Environmental experts say urban greenspaces provide many benefits for city residents. Trees and plants help improve air quality by filtering pollutants and producing oxygen. Green areas also help lower temperatures in crowded urban areas by providing shade and cooling the surrounding environment.
In addition, these spaces support biodiversity by providing shelter for birds, insects, and other small wildlife that can survive within city environments. Access to greenery also benefits public health, giving residents places to relax, walk, and enjoy nature even in a busy city setting.
The San Juan validation is part of a wider regional baseline assessment aimed at determining the total remaining urban greenspaces across Metro Manila. This effort will help the government understand how much green space still exists in the highly urbanized region.
So far, 13 out of the 17 cities and municipalities in Metro Manila have already completed their baseline assessments through similar ground validation activities. The remaining areas will undergo the same process in the coming months.
Officials say gathering accurate data is essential for future environmental planning. Reliable information helps identify priority areas for urban greening projects, tree planting programs, and environmental protection efforts.
The data will also support stronger coordination between national government agencies and local government units. With clearer information, city planners can develop programs that balance urban development with environmental protection.
As Metro Manila continues to grow, experts stress that protecting and expanding urban greenspaces will remain crucial for building healthier, cooler, and more sustainable cities for future generations.
For residents of San Juan and the rest of Metro Manila, these small green spaces serve as quiet reminders that even in the middle of a crowded city, nature still has a place.
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