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Teotepeque, nestled within the La Libertad department of El Salvador, occupies a geographically significant position within the Central American Volcanic Arc. Located at approximately 13.5853° N, 89.5183° W, the municipality sits at an elevation of roughly 650 meters (2,133 feet) above sea level, contributing to a cooler, more temperate climate compared to coastal regions. The surrounding landscape is characterized by rolling hills and valleys, typical of the volcanic terrain, interspersed with agricultural land primarily dedicated to coffee and sugarcane cultivation. This agricultural activity, while vital to the local economy, can contribute to localized air pollution through the use of fertilizers and the burning of agricultural waste, particularly during harvest seasons. Teotepeque’s proximity to the Pacific coast, approximately 30 kilometers (19 miles) away, means it experiences influences from both inland volcanic activity and coastal breezes. The urban-rural gradient shifts rapidly; the town itself is relatively compact, transitioning quickly into smaller farming communities and rural landscapes. The volcanic soil, while fertile, is also prone to erosion, which can exacerbate dust pollution during the dry season. There are no major industrial belts directly adjacent to Teotepeque, but the broader La Libertad department hosts some industrial activity, and prevailing winds can occasionally carry pollutants from these sources. The terrain’s topography, with its hills and valleys, can also trap pollutants, leading to localized air quality challenges, especially during periods of stagnant air.

Teotepeque’s tropical climate dictates a distinct wet and dry season pattern, significantly influencing air quality. The dry season, typically spanning November to April, often brings clearer skies but also heightened particulate matter pollution. Reduced rainfall means less natural cleansing of the atmosphere, and agricultural burning, a common practice for land clearing and crop residue disposal, becomes more prevalent, releasing significant amounts of smoke and particulate matter. Temperature inversions, where cooler air becomes trapped beneath a layer of warmer air, are more frequent during this period, preventing pollutants from dispersing vertically. The dry winds can also stir up dust from agricultural fields and unpaved roads, further degrading air quality. The wet season, from May to October, generally sees improved air quality due to frequent rainfall that washes pollutants from the atmosphere. However, periods of heavy fog, particularly in the mornings, can trap moisture and pollutants close to the ground, creating localized pockets of poor air quality. During the transition months (April/May and October/November), wind patterns are often variable, leading to unpredictable air quality fluctuations. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activity during peak burning periods and days with stagnant air. Even during the wet season, monitoring local conditions and avoiding areas with visible smoke or fog is advisable.