Urupês Air Quality Index (AQI)

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Urupês, a municipality nestled in the interior of São Paulo state, Brazil, presents a unique geographic context influencing its air quality. Located at coordinates -21.2019, -49.2900, the city sits within a gently undulating terrain characteristic of the state’s inland plateau. The elevation, averaging around 550 meters, contributes to cooler temperatures compared to coastal regions, but also creates conditions conducive to temperature inversions. Urupês is not directly adjacent to large bodies of water; however, it lies within the broader watershed of the Rio Grande, impacting local humidity and potential for atmospheric moisture. The surrounding landscape is predominantly agricultural, dominated by sugarcane and soybean cultivation, alongside pockets of native *cerrado* vegetation. While Urupês itself is a relatively small urban center with a population of 13,744, its proximity to larger industrial hubs within the São Paulo metropolitan area – particularly those concentrated along the Bandeirantes and Anhanguera highways – means it’s susceptible to long-range pollutant transport. The urban-rural gradient is fairly sharp, with agricultural lands immediately bordering the city limits. This proximity to agricultural practices introduces potential for particulate matter from field preparation and burning, impacting local air quality, especially during dry seasons. The prevailing winds, generally from the south-southeast, can carry pollutants from these sources directly over Urupês.

Urupês experiences a distinct wet and dry season, rather than traditional four seasons. Air quality in Urupês is most compromised during the dry season, typically from May to September. This period sees reduced rainfall, leading to a build-up of particulate matter from agricultural activities like sugarcane burning and soil preparation. Lower humidity also means less atmospheric scavenging of pollutants. Temperature inversions, common during cooler nights in the dry season, trap pollutants near the ground, exacerbating air quality issues. October and November bring the onset of the wet season, offering significant improvements in air quality as rainfall washes pollutants from the atmosphere. However, increased humidity can also contribute to the formation of mold spores, potentially affecting respiratory health. December to February are the wettest months, generally offering the cleanest air, though localized flooding can sometimes disrupt transportation and indirectly impact air quality through increased vehicle congestion. March and April represent a transitional period. Sensitive groups – children, the elderly, and those with respiratory conditions – should exercise caution during the dry season, limiting strenuous outdoor activity on days with visible haze. Monitoring wind direction is crucial; winds from the southeast are more likely to carry pollutants from industrial areas.