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Lemery, Iloilo, Philippines, occupies a strategically important position within the Panay Island region. Situated at approximately 11.23° N, 122.93° E, the municipality lies on the southeastern coast of Iloilo province, nestled along the Guimaras Strait. The terrain is characterized by a mix of gently sloping hills and coastal plains, rising to an average elevation of around 30 meters above sea level. This low elevation, combined with its coastal location, significantly influences local air quality. The surrounding landscape is a blend of agricultural lands – primarily rice paddies and coconut plantations – and small-scale fishing communities. To the west lies the island of Guimaras, a significant producer of mangoes, and the strait acts as a conduit for maritime traffic, potentially introducing pollutants. Inland, the terrain gradually rises, transitioning into more rugged hills. Lemery’s urban character is primarily that of a small, developing municipality, with a relatively low population density. There isn't a major industrial belt directly adjacent to Lemery; however, Iloilo City, a larger urban center with industrial activity, is within a reasonable distance (approximately 60km), and its air pollution can occasionally be transported by prevailing winds. The urban-rural gradient is relatively smooth, with agricultural activities seamlessly blending into the residential areas. The proximity to the Guimaras Strait and the prevailing wind patterns from the southwest contribute to the dispersal of pollutants, but also introduce marine aerosols which can impact visibility and respiratory health. The surrounding agricultural practices, while generally small-scale, can still contribute to localized air quality issues, particularly during burning seasons.

Lemery’s tropical climate dictates a distinct wet and dry season, profoundly impacting its air quality. The dry season, typically spanning from November to May, often sees a slight improvement in air quality due to reduced rainfall and lower humidity. However, this period can also be punctuated by periods of stagnant air, particularly during temperature inversions, which trap pollutants near the ground. These inversions are more common in the early morning hours, leading to a build-up of particulate matter. Agricultural burning, a common practice for land clearing and crop residue disposal, is most prevalent during the transition from the wet to dry season (October-November), significantly elevating particulate matter concentrations and creating localized haze. The wet season, from June to October, brings frequent rainfall and increased humidity, generally leading to a cleansing effect on the atmosphere. Monsoon winds from the southwest prevail during this time, dispersing pollutants and reducing their concentration. However, heavy rainfall can also lead to increased levels of mold and fungal spores, impacting respiratory health. Fog, while infrequent, can occur during the cooler months (December-January), trapping pollutants and reducing visibility. Sensitive groups, such as children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during periods of agricultural burning and temperature inversions, limiting outdoor activity during early morning hours. The months of November and December, with their combination of agricultural burning and potential for temperature inversions, are generally periods to avoid strenuous outdoor activities.