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Matanog, nestled in the province of Maguindanao, Philippines (7.4700° N, 124.2500° E), occupies a geographically significant position within the broader Bangsamoro Autonomous Region in Muslim Mindanao. The municipality sits on the western coast of Maguindanao, bordering the Moro Gulf, a major arm of the Celebes Sea. This coastal location inherently influences local weather patterns and, consequently, air quality. Matanog’s terrain is predominantly low-lying, characterized by alluvial plains formed by river systems flowing from the interior highlands. Elevation rarely exceeds 30 meters above sea level, contributing to a relatively flat landscape. The surrounding landscape is a mix of agricultural land – primarily rice paddies and coconut plantations – and mangrove forests along the coastline. This agricultural activity, while vital to the local economy, can contribute to localized air pollution through the use of fertilizers and occasional burning of agricultural waste. The urban–rural gradient is gradual; Matanog itself is a small municipality with a dispersed population, transitioning quickly to rural agricultural areas. There are no major industrial belts directly adjacent to Matanog, however, larger industrial zones in nearby Cotabato City could potentially influence regional air quality patterns, particularly through long-range transport of pollutants. The proximity to the Moro Gulf also means that sea breezes play a crucial role in dispersing pollutants, though stagnant conditions can lead to localized build-up, especially during periods of reduced wind activity. The generally humid, tropical climate further impacts pollutant behaviour, affecting both their dispersion and chemical reactions.

Matanog’s tropical climate dictates a wet and dry season pattern, significantly impacting air quality dynamics. The wet season, typically spanning from June to November, brings frequent rainfall and high humidity. While rainfall naturally helps to cleanse the atmosphere by removing particulate matter, the increased humidity can trap pollutants closer to the ground, particularly during periods of reduced wind. The monsoon winds, prevalent during this period, can also transport pollutants from distant sources, potentially impacting air quality even in relatively isolated areas like Matanog. The dry season, from December to May, is characterized by lower rainfall and generally clearer skies. However, this period often sees a rise in localized pollution due to reduced atmospheric cleansing. Temperature inversions, where cooler air is trapped beneath warmer air, are more common during the dry season, preventing pollutants from dispersing vertically. Agricultural burning, though regulated, can also occur more frequently during this time, contributing to elevated particulate matter. Months like April and May, with consistently high temperatures and minimal rainfall, are often periods of heightened concern. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit prolonged outdoor activity during these periods. During the wet season, while overall pollution may be lower, the high humidity can exacerbate respiratory issues for some individuals. Maintaining indoor air quality through proper ventilation and air purification is advisable year-round, but particularly important during periods of stagnant air or increased agricultural activity.