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Feijó, nestled in the state of Acre, Brazil, occupies a crucial position within the Amazon rainforest basin. Located at approximately -8.1639 latitude and -70.3539 longitude, the city’s geography is defined by the undulating terrain of the western Amazon. The elevation is relatively low, contributing to high humidity levels. Feijó sits near the Ipixuna River, a tributary of the Purus River, and is heavily influenced by the river’s seasonal flooding patterns. The surrounding landscape is overwhelmingly rainforest, transitioning to more open areas with increasing distance from the riverbanks, where small-scale agriculture and cattle ranching are practiced. While Feijó isn’t characterized by large industrial belts, deforestation for agricultural expansion in the wider Acre region is a significant factor impacting regional air quality. The urban-rural gradient is sharp; the city itself is a relatively small settlement surrounded by vast, sparsely populated rainforest. This proximity to extensive vegetation generally offers some natural air filtration, but the increasing frequency of wildfires and land clearing activities pose a growing threat. The city’s location within the Amazonian humidity belt means consistent moisture, influencing pollutant dispersion and the formation of secondary pollutants. The prevailing winds, often influenced by regional weather systems, play a key role in transporting pollutants from surrounding areas into and out of Feijó.

Feijó experiences a distinct wet and dry season, rather than traditional four seasons. Air quality in Feijó is most compromised during the dry season, typically from June to November. Reduced rainfall during these months concentrates pollutants, particularly particulate matter from agricultural burning and forest fires, which are more frequent as land is cleared for pasture and crops. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near the ground, exacerbating air quality issues. The wet season, from December to May, generally brings improved air quality as rainfall washes pollutants from the atmosphere and increases humidity, suppressing dust. However, even during the wet season, localized pollution can occur from vehicle emissions and small-scale burning. February and March, during peak rainfall, are typically the best months for outdoor activity. Sensitive groups – children, the elderly, and individuals with respiratory conditions – should limit outdoor exposure during the dry season, particularly in August and September when fire activity is often highest. Wearing masks (N95 or equivalent) can provide some protection. Monitoring local fire reports and avoiding areas with visible smoke is crucial. The high humidity throughout the year can also contribute to mold growth, impacting indoor air quality.