Maués Air Quality Index (AQI)

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Maués, Amazonas, Brazil, occupies a strategically important position within the Amazon rainforest, approximately 180 kilometers northwest of Manaus. Situated at -3.3836° latitude and -57.7186° longitude, the city’s geography is dominated by the Purus River, a major tributary of the Amazon, which significantly influences local climate and air circulation patterns. The terrain is predominantly low-lying, characterized by alluvial plains and várzea forests – seasonally flooded forests – resulting in an average elevation of just 55 meters above sea level. This flat topography limits vertical mixing of air, potentially trapping pollutants closer to the ground. The surrounding landscape is almost entirely dense rainforest, a vast carbon sink that generally contributes to cleaner air regionally. However, agricultural expansion, particularly soybean and cattle farming in the broader Amazonas state, introduces localized sources of particulate matter and greenhouse gases. The urban–rural gradient transitions rapidly from the town center to dense jungle, with small-scale agriculture and riverside communities interspersed throughout the municipality. Maués’s location away from major industrial belts reduces direct industrial pollution, but it is susceptible to transboundary pollution events originating from deforestation fires further south and east within the Amazon basin. The river itself acts as a transport corridor, potentially carrying pollutants from upstream sources. The humid, tropical climate, with high rainfall and temperatures, also influences the dispersion of airborne contaminants, often leading to stagnant air conditions during drier periods.

Maués experiences a classic tropical climate with distinct wet and dry seasons, profoundly impacting air quality. The wet season, typically from December to May, brings consistently high rainfall and humidity, which naturally scavenges particulate matter from the atmosphere, leading to generally improved air quality. Frequent rain washes away dust and pollutants, and the increased cloud cover reduces solar radiation, suppressing photochemical smog formation. However, intense rainfall events can also mobilize soil particles, temporarily increasing dust levels. The dry season, from June to November, presents a contrasting scenario. Reduced rainfall and lower humidity create conditions conducive to the accumulation of pollutants. The lack of rain means fewer opportunities for atmospheric cleansing. Furthermore, the dry season coincides with the peak of deforestation activity further afield, resulting in frequent smoke plumes from agricultural burning being transported by prevailing winds towards Maués. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near the ground, exacerbating the problem. August and September are particularly concerning months, often experiencing the highest levels of particulate matter due to the combined effects of regional burning and stagnant air. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during these periods. During the wet season, while overall air quality is better, heavy downpours can still trigger localized flooding and associated mold growth, impacting indoor air quality. Maintaining good ventilation and addressing dampness are crucial during this time.