Palmeiras Air Quality Index (AQI)

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Palmeiras, a municipality nestled within the state of Maranhão, Brazil, occupies a geographically significant position in the country’s northeastern region. Located at approximately -2.6450° latitude and -44.8950° longitude, the city is situated within the Amazon rainforest biome, though increasingly impacted by the transition zones known as *cerrado* and *caatinga*. The terrain is generally flat, characteristic of the Maranhão Gulf coastal plain, with an elevation hovering around a modest few meters above sea level. This low elevation, combined with its proximity to the Pindaré River and the extensive mangrove ecosystems along the coast, influences local humidity and air circulation patterns. Palmeiras’ urban character is that of a developing inland city, serving as a regional hub for agriculture, particularly the cultivation of açai and other Amazonian fruits. The surrounding landscape is dominated by dense rainforest interspersed with agricultural land. The urban-rural gradient is relatively sharp, with the city centre transitioning quickly to rural areas. Air quality is potentially affected by seasonal burning for land clearing, dust from agricultural activities, and limited industrial emissions, though the latter are currently less pronounced than in larger Brazilian cities. The prevailing winds, influenced by the trade winds and the intertropical convergence zone, play a crucial role in dispersing or concentrating pollutants.

Palmeiras experiences a distinct wet and dry season, rather than traditional four seasons. Air quality in Palmeiras is most compromised during the dry season, typically from June to November. This period sees increased agricultural burning to prepare land for the next planting cycle, releasing significant particulate matter (PM2.5 and PM10) and other pollutants into the atmosphere. Reduced rainfall during these months also limits the natural cleansing effect of precipitation, allowing pollutants to accumulate. 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. Frequent rainfall washes away pollutants, and higher humidity can suppress dust. However, even during the wet season, localised pollution can occur from vehicle emissions and small-scale burning. February and March, during peak rainfall, are generally the most favourable months for outdoor activity. Sensitive groups – children, the elderly, and individuals with respiratory conditions – should limit outdoor exposure during the dry season, particularly in areas downwind from agricultural burning. Monitoring wind direction and avoiding strenuous activity on days with visible haze is advisable.