San Martín Zapotitlán Air Quality Index (AQI)

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San Martín Zapotitlán, nestled within the Retalhuleu department of Guatemala, occupies a geographically significant position in the southwestern part of the country. Located at coordinates 14.6000, -91.6000, the city sits amidst a landscape dominated by volcanic peaks and fertile plains, part of the Pacific Lowlands. The terrain is undulating, transitioning from the foothills of the Sierra Madre mountains to flatter agricultural lands. This location, at approximately 650 meters (2,133 feet) above sea level, influences air quality through localized weather patterns and pollutant dispersion. The city’s proximity to the Pacific coast, roughly 30 kilometers distant, introduces maritime influences, including humidity and occasional coastal breezes. Surrounding San Martín Zapotitlán are extensive agricultural zones, primarily dedicated to sugarcane and coffee cultivation, which contribute to seasonal biomass burning. The urban-rural gradient is relatively sharp, with the city centre giving way quickly to agricultural fields and forested areas. This proximity to agricultural practices, combined with potential for temperature inversions in the valley, can trap pollutants, impacting local air quality. The region’s volcanic activity, while not directly impacting daily air quality, contributes to the geological composition of particulate matter. The city’s relatively small size and limited industrial activity suggest that transport and agricultural emissions are the primary concerns.

San Martín Zapotitlán experiences a distinct wet and dry season, heavily influencing air quality. The dry season, typically from November to April, sees a significant increase in particulate matter due to agricultural burning for sugarcane harvesting and land preparation. Reduced rainfall means less atmospheric cleansing, and stable atmospheric conditions can lead to pollutant build-up. February and March are often the months with the poorest air quality. Conversely, the wet season, spanning May to October, brings frequent rainfall that effectively washes pollutants from the air. However, increased humidity can also promote the formation of mold and allergens, impacting respiratory health. August and September, the peak of the rainy season, generally offer the best air quality. Temperature inversions, common during the cooler nights of the dry season, exacerbate pollution by trapping emissions near ground level. Wind patterns, influenced by the Pacific coast and surrounding mountains, play a crucial role in pollutant dispersion, with calmer conditions during the dry season hindering ventilation. Sensitive groups, including children, the elderly, and those with respiratory conditions, should limit outdoor activity during the dry season, particularly during periods of agricultural burning. Monitoring local conditions and staying indoors on high-pollution days is advisable.