Roseira Air Quality Index (AQI)

Loading live AQI data...

Loading historical AQI trends...

Roseira, a small municipality nestled within the state of São Paulo, Brazil, presents a unique geographic context influencing its air quality. Located at coordinates -22.8978, -45.3050, the city occupies a portion of the rolling hills and valleys characteristic of the southeastern Brazilian landscape. Its elevation, approximately 850 meters above sea level, contributes to cooler temperatures compared to lower-lying areas, but also increases susceptibility to temperature inversions. Roseira is not directly adjacent to large bodies of water, though it lies within the broader watershed of the Paraíba do Sul River. The surrounding landscape is predominantly agricultural, with significant sugarcane and coffee cultivation, alongside patches of Atlantic Forest remnants. This agricultural activity, while economically important, introduces potential sources of particulate matter from field burning and fertilizer application. The urban-rural gradient is quite sharp; Roseira’s small population of 10,832 means that agricultural land quickly dominates the periphery. The proximity to larger industrial centers within the São Paulo metropolitan area, while not immediately adjacent, means that long-range transport of pollutants is a factor. Topography channels air flow, potentially trapping pollutants during calm weather conditions, exacerbating local air quality challenges. The city’s position within a valley increases the likelihood of stagnant air masses.

Roseira experiences a distinct wet and dry season, rather than traditional four seasons. Air quality in Roseira is most compromised during the dry season, typically from May to September. This period sees reduced rainfall, leading to increased dust and particulate matter from agricultural activities – sugarcane harvesting and preparation are particularly impactful. Lower humidity also means pollutants are less likely to be washed out of the atmosphere. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near ground level, worsening conditions. October and November bring the onset of the wet season, offering a period of improved air quality as rainfall effectively cleanses the atmosphere. However, intense rainfall can also lead to soil erosion, contributing to sediment in the air. December to February are the wettest months, generally offering the best air quality, though localized flooding can sometimes stir up mold spores. March and April represent a transitional period. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the dry season, particularly in the late afternoon when pollutant concentrations tend to peak. Monitoring wind patterns is crucial; winds from the direction of agricultural burning will carry increased particulate matter.