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San Antonio Aguas Calientes, nestled within the Sacatepéquez department of Guatemala, occupies a unique geographic position in the central highlands. The city’s name, translating to ‘Saint Anthony Hot Waters,’ hints at its volcanic origins and the presence of thermal springs – a defining characteristic of the landscape. Situated at an elevation of approximately 1,520 meters (4,987 feet), the terrain is dramatically hilly, part of the larger Sierra de las Minas mountain range. This mountainous topography significantly influences air quality, creating localized pockets where pollutants can accumulate due to limited atmospheric mixing. The surrounding landscape is dominated by coffee plantations, small-scale agriculture, and patches of cloud forest. While not directly adjacent to a major body of water, the city is within a watershed feeding into regional river systems. The urban-rural gradient is relatively sharp; the city centre is densely populated, transitioning quickly to agricultural lands and forested slopes. There are no large industrial belts within San Antonio Aguas Calientes itself, but regional transport routes and agricultural practices contribute to particulate matter and potential pesticide drift. The valley location, while visually appealing, can trap cooler air, exacerbating pollution during calm weather conditions. The prevalence of wood-burning stoves for cooking and heating, particularly in more rural areas surrounding the city, is a key local emission source.

Air quality in San Antonio Aguas Calientes follows a distinct seasonal pattern largely dictated by Guatemala’s wet and dry seasons. The dry season, typically from November to April, sees the most concerning air quality. Reduced rainfall means less atmospheric cleansing, and increased dust from agricultural activities and unpaved roads contributes to higher particulate matter concentrations. Temperature inversions, common in the valley during the cooler mornings of the dry season, trap pollutants near the ground. February and March are often the months with the poorest air quality. The onset of the wet season in May brings a significant improvement. Frequent rainfall washes away pollutants, and increased humidity reduces dust suspension. However, the wet season also brings increased fungal spores, potentially impacting those with respiratory sensitivities. August and September, the peak of the rainy season, generally offer the cleanest air. The transition periods – April/May and October/November – are characterized by fluctuating conditions. Sensitive groups, including children, the elderly, and those with pre-existing respiratory conditions, should limit strenuous outdoor activity during the dry season and monitor their health closely. Woodsmoke is a consistent contributor to air pollution year-round, but its impact is most pronounced during the drier months.