Quezon Air Quality Index (AQI)

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Quezon City, nestled within the sprawling metropolis of Metro Manila, Philippines, occupies a strategically significant position in the Luzon island’s eastern periphery. Its coordinates, 14.0068° N, 122.1824° E, place it within a predominantly lowland environment, characterized by gently undulating terrain transitioning from the foothills of the Sierra Madre mountain range to the west. This range acts as a partial barrier, influencing prevailing wind patterns and, crucially, trapping pollutants under certain meteorological conditions. The city’s proximity to the Pasig River and Laguna de Bay, the Philippines’ largest lake, introduces a complex interplay of humidity and potential for localized fog formation, which can exacerbate air quality issues by reducing atmospheric dispersion. Quezon City’s urban fabric is a dense mix of residential areas, commercial districts, and industrial pockets, reflecting its role as a major administrative and economic hub. The urban–rural gradient is relatively abrupt, with agricultural lands and smaller settlements existing just beyond the city limits, contributing to occasional rural dust and agricultural emissions. The surrounding landscape is a mosaic of urban development, interspersed with pockets of green space, including parks and smaller forested areas, which offer limited but valuable air purification services. The city’s location within a major river basin also means it is susceptible to pollutants originating from upstream sources, further complicating air quality management.

Quezon City’s tropical climate dictates a distinct wet and dry season, profoundly impacting its air quality profile. The dry season, typically spanning November to May, often witnesses a gradual increase in pollution levels. Reduced rainfall means fewer opportunities for atmospheric cleansing, and the prevailing northeast monsoon winds, known as the ‘amihan,’ can sometimes become stagnant, leading to localized temperature inversions. These inversions trap pollutants close to the ground, particularly in valleys and low-lying areas. The months of February and March frequently experience hazy conditions due to this phenomenon. Conversely, the wet season (June to October), characterized by the southwest monsoon (‘habagat’) and frequent rainfall, generally brings a temporary respite from elevated pollution. However, heavy rainfall can also lead to increased runoff carrying particulate matter and pollutants into waterways, indirectly affecting air quality. Fog, particularly during the cooler months of November and December, can significantly reduce visibility and concentrate pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during periods of stagnant air and reduced visibility, limiting outdoor activities and ensuring adequate ventilation. During the dry season, monitoring local weather forecasts for temperature inversion warnings is advisable, and opting for indoor activities during these periods is recommended. The increased humidity during the wet season can also exacerbate respiratory issues for some individuals, necessitating careful management of indoor air quality.