Severínia Air Quality Index (AQI)

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Severínia, a municipality nestled within the state of São Paulo, Brazil, occupies a relatively flat portion of the state’s interior plateau. Located at approximately -20.8089 latitude and -48.8028 longitude, the city’s geography is defined by gently rolling hills and fertile agricultural lands. The terrain is characteristic of the broader São Paulo state landscape, a transition zone between the coastal highlands and the plains further west. Severínia’s elevation, around 580 meters above sea level, contributes to moderate temperatures but also influences atmospheric circulation patterns. The surrounding landscape is dominated by sugarcane plantations and other agricultural activities, a key economic driver for the region. The Ribeirão Preto River is a significant waterway nearby, though its distance means direct influence on local air quality is limited. The urban-rural gradient is quite sharp; Severínia is a smaller city surrounded by extensive agricultural zones. This proximity to agricultural land, while economically beneficial, introduces potential sources of particulate matter from field preparation, harvesting, and the burning of agricultural residue. The lack of significant industrial belts within the immediate vicinity means that agricultural practices are the dominant factor influencing local air quality, alongside vehicle emissions within the city itself. The prevailing winds, generally from the south-southeast, can transport pollutants from larger urban centres to the north and east.

Severínia experiences a distinct wet and dry season, rather than traditional four seasons. Air quality in Severínia 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 is particularly prevalent during these months. Lower humidity also means pollutants become more concentrated. Temperature inversions, common during cool, clear 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 a period of improved air quality as rainfall washes pollutants from the atmosphere. However, increased soil moisture can also lead to fungal spore release, potentially impacting those with respiratory sensitivities. December to February are the wettest months, generally offering the cleanest air, though localized flooding can sometimes disrupt transportation and increase vehicle idling, contributing to emissions. March and April represent a transitional period. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should exercise caution during the dry season, limiting strenuous outdoor activity and monitoring their health. Avoiding peak agricultural activity times and staying indoors on particularly dusty days is advisable.