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Xapuri, nestled within the state of Acre in northwestern Brazil, occupies a strategically important position within the Amazon rainforest biome. Located at approximately -10.6517° latitude and -68.5044° longitude, the city’s geography is dominated by undulating terrain, characteristic of the Amazonian piedmont. The elevation ranges from roughly 150 to 300 meters above sea level, influencing local air circulation patterns. Xapuri sits on the periphery of the expansive Amazon basin, surrounded by dense tropical rainforest, a landscape largely untouched by large-scale industrial development. The Purus River, a major tributary of the Amazon, flows relatively nearby, impacting humidity levels and potentially influencing the dispersion of pollutants. The urban character of Xapuri is primarily that of a regional service center, supporting agricultural activities prevalent in the surrounding area. The dominant land use is a gradual transition from dense forest to small-scale agriculture, including cattle ranching and cultivation of crops like cassava and beans, creating a distinct urban–rural gradient. While Xapuri itself lacks significant heavy industry, the broader Acre region experiences some logging and timber processing, which can contribute to localized air quality concerns. The city’s location within the Amazon basin means it is highly susceptible to the effects of deforestation and land-use change in the wider region, which can impact air quality through increased particulate matter and altered regional climate patterns. The surrounding landscape acts as a natural filter, but also a potential source of biomass burning during drier periods.

Xapuri’s tropical climate dictates a distinct wet and dry season cycle, profoundly influencing its air quality. The wet season, typically spanning from November to April, brings consistent rainfall and high humidity, generally leading to improved air quality due to frequent precipitation washing away particulate matter. However, persistent cloud cover can reduce solar radiation, potentially leading to stagnant air conditions and localized pollutant build-up, particularly in areas with limited ventilation. The dry season, from May to October, presents a more complex picture. Reduced rainfall and increased evapotranspiration lead to lower humidity, creating a more conducive environment for dust and particulate matter to become airborne. Agricultural burning, a common practice for land clearing and crop residue management, significantly elevates levels of smoke and particulate pollution during this period, especially in September and October. Temperature inversions, where cooler air is trapped beneath warmer air, can also occur during the dry season, hindering vertical mixing and trapping pollutants near the ground. Fog, though infrequent, can exacerbate these conditions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly when agricultural burning is prevalent. Limiting outdoor exertion during periods of visible smoke is advisable. Maintaining indoor air quality through proper ventilation and air filtration can also provide some protection. The transition months (April/May and October/November) often experience fluctuating conditions, requiring vigilance and awareness of local air quality conditions.