San Luis Air Quality Index (AQI)

Loading live AQI data...

Loading historical AQI trends...

San Luis, Batangas, nestled on the southwestern coast of Luzon Island in the Philippines, occupies a geographically significant position within the Calabarzon region. Its coordinates (13.8300, 120.9300) place it within a coastal plain characterized by gently rolling hills and low-lying areas, transitioning to steeper terrain further inland. The municipality borders Taal Lake, a large volcanic crater lake, and the Balayan Bay, both crucial bodies of water influencing local climate and air circulation patterns. The surrounding landscape is a mosaic of agricultural land – primarily rice paddies and coconut plantations – interspersed with small-scale aquaculture farms, particularly fishponds. This agricultural activity, while vital to the local economy, contributes to potential sources of particulate matter and ammonia emissions. The urban–rural gradient is relatively gradual; San Luis retains a largely rural character, with a small central settlement and dispersed barangays. Elevation varies, generally remaining below 100 meters above sea level, which limits vertical mixing of air pollutants. The proximity to Manila, approximately 100 kilometers north, means San Luis is susceptible to the advection of pollutants from the capital’s industrial and vehicular emissions, particularly during periods of weaker winds. The prevailing southwest monsoon winds, however, can sometimes offer a degree of cleansing, dispersing pollutants offshore. The terrain’s topography, combined with the coastal location and surrounding agricultural zones, creates a complex interplay of factors impacting air quality, making it sensitive to both local and regional pollution sources.

San Luis, experiencing a tropical climate, doesn't have distinct four seasons but rather a wet (rainy) and dry season. Air quality is significantly influenced by these periods. The wet season, typically from June to November, often sees a slight improvement in air quality due to frequent rainfall which naturally washes away particulate matter and reduces dust. However, prolonged periods of heavy rain can lead to localized flooding, potentially releasing pollutants from stagnant water and impacting air quality temporarily. The dry season, from December to May, presents a greater challenge. Reduced rainfall and lower humidity contribute to a build-up of dust and particulate matter, particularly from agricultural activities like land clearing and harvesting. Temperature inversions, common during the cooler months (January-February), trap pollutants near the ground, exacerbating the situation. Fog, occasionally occurring during the dry season, further restricts air movement and concentrates pollutants. March and April often experience elevated levels of biomass burning from agricultural practices, contributing to smoke and haze. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of haze or fog. Limiting outdoor exertion and avoiding areas with visible smoke are advisable. The monsoon season, while bringing rain, can also bring in pollutants from other regions, so vigilance is always necessary. Maintaining awareness of local weather conditions and potential sources of pollution is key to protecting respiratory health throughout the year.