Sampaloc Air Quality Index (AQI)

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Sampaloc is a densely populated urban district in Manila, Philippines, situated at approximately 14.6031°N, 121.0022°E. As part of the National Capital Region, it lies within the vast Manila Bay coastal plain, with an average elevation of just 5 meters above sea level, making it vulnerable to flooding and poor air dispersion. The district is bordered by the Pasig River to the south and is approximately 10 kilometers east of Manila Bay, whose proximity influences local humidity and occasional sea breezes that can temporarily alleviate pollution. Sampaloc's geography is characterized by intense urbanization, with minimal green spaces and a high building density that traps pollutants. It is surrounded by other urban districts like Quiapo and Santa Mesa, forming part of Metro Manila's continuous urban sprawl. The region lacks significant natural barriers like mountains, but the Sierra Madre range to the east can sometimes block easterly winds, contributing to stagnant air conditions. Proximity to industrial zones in nearby cities such as Caloocan and Valenzuela adds to pollution sources, while the urban–rural gradient shows a sharp transition from Sampaloc's core to more mixed-use areas with some informal settlements. This low-lying, congested setting exacerbates air quality issues by limiting ventilation and concentrating emissions from vehicles, construction, and residential activities.

In Sampaloc, air quality fluctuates with the Philippines' tropical monsoon climate, characterized by distinct wet and dry seasons rather than four traditional seasons. During the dry season from November to April, pollution typically peaks, especially from January to March, due to reduced rainfall and increased temperature inversions that trap pollutants near the ground. The northeast monsoon (Amihan) brings cooler, drier air but can also lead to stagnant conditions with light winds, worsening particulate matter accumulation from vehicles and industrial sources. Sensitive groups, such as children and the elderly, should limit outdoor activities during these months, particularly in the early mornings when inversions are strongest. The wet season from May to October sees improved air quality, with the southwest monsoon (Habagat) bringing heavy rains that wash pollutants from the air, though occasional typhoons can cause temporary spikes in dust and debris. June to August are generally the best months for outdoor activities, as frequent showers reduce pollution levels. However, high humidity during this period can exacerbate respiratory issues for those with asthma. Throughout the year, localized factors like traffic congestion and construction projects in Sampaloc contribute to consistent baseline pollution, making year-round vigilance advisable for residents with pre-existing health conditions.