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Alotenango, nestled within the department of Sacatepéquez, Guatemala, occupies a strategically significant position in the Guatemalan Highlands. Located approximately 15 kilometers northwest of Guatemala City, it sits at an elevation of roughly 2,150 meters (7,050 feet) above sea level, placing it firmly within a high-altitude valley environment. The surrounding landscape is dominated by volcanic peaks, including the imposing Volcán de Pacaya to the south, a constantly active volcano whose emissions contribute to regional air quality concerns. The terrain is characterized by steep slopes and agricultural terraces, a testament to the area’s long history of intensive farming. This agricultural activity, particularly the burning of fields for land clearing and crop residue, is a significant localized source of particulate matter. Alotenango’s proximity to Guatemala City, a major industrial and transportation hub, exposes it to pollutants transported by prevailing winds. The urban–rural gradient is relatively sharp; the town transitions quickly into smaller agricultural communities and rural landscapes. While not directly adjacent to major bodies of water, the valley’s drainage patterns influence local microclimates and humidity levels. The valley floor itself is a relatively narrow band, funneling airflows and potentially exacerbating pollution episodes. The surrounding highlands act as a barrier, limiting dispersion and trapping pollutants, especially during periods of stable atmospheric conditions. The town’s location within a densely populated region means it is susceptible to regional pollution trends and the cumulative impact of multiple sources.

Alotenango’s air quality is heavily influenced by its tropical highland climate, exhibiting a distinct wet and dry season pattern. The dry season, typically spanning November through April, often sees a noticeable increase in particulate matter concentrations. This is largely attributable to agricultural burning practices, which intensify as farmers prepare fields for the planting season. Reduced rainfall during this period also limits the natural cleansing effect of precipitation, allowing pollutants to persist longer. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near the ground, further degrading air quality. The wet season, from May to October, brings increased rainfall and higher humidity, generally leading to improved air quality as pollutants are washed from the atmosphere. However, periods of heavy fog, particularly in the mornings, can temporarily reduce visibility and trap moisture-laden pollutants. Wind patterns play a crucial role; prevailing winds from the south-east can carry volcanic emissions and pollutants from Guatemala City towards Alotenango. During the transition months (April/May and October/November), air quality can be particularly variable, influenced by shifting wind patterns and fluctuating rainfall. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural burning or when temperature inversions are present. Limiting outdoor exertion and wearing masks can offer some protection. The increased humidity of the wet season can exacerbate respiratory issues for some, so maintaining indoor air quality is also important.