Castilho Air Quality Index (AQI)

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Castilho, a municipality nestled within the state of São Paulo, Brazil, occupies a relatively flat portion of the state’s interior, at coordinates -20.8722, -51.4875. With a population of approximately 19,873, it’s a smaller urban centre within a predominantly agricultural landscape. The terrain is gently undulating, characteristic of the broader Paraná sedimentary basin. Castilho’s location isn’t directly adjacent to major bodies of water, though it lies within the Tietê River basin, benefitting from, and potentially impacting, this crucial waterway. The surrounding region is heavily devoted to sugarcane and soybean cultivation, with associated agricultural practices contributing to particulate matter and potential pesticide drift. While not a major industrial hub itself, Castilho’s proximity to larger industrial centres within São Paulo state means it can experience transboundary pollution. The urban-rural gradient is quite sharp; the town itself is a concentrated area of activity, quickly giving way to expansive agricultural fields. This proximity to agricultural land, combined with potential regional industrial emissions, significantly influences local air quality. The lack of significant topographical features limits natural dispersion of pollutants, making Castilho susceptible to air stagnation events. The prevailing winds, generally from the south-southeast, can carry pollutants from more developed areas northward.

Castilho experiences a tropical climate with distinct wet and dry seasons, heavily influencing air quality. The dry season, typically from May to September, sees significantly reduced rainfall, leading to increased dust and particulate matter from agricultural activities – sugarcane harvesting and land 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 this period, trap pollutants near ground level, exacerbating conditions. October to April marks the wet season, bringing relief through rainfall that effectively scrubs the air. However, increased humidity can also promote the formation of mould spores, potentially impacting respiratory health. February and March, the wettest months, generally offer the best air quality. Sensitive groups – children, the elderly, and those with respiratory conditions – should be particularly cautious during the dry season, limiting strenuous outdoor activity. Fog, common during cooler mornings, can trap pollutants, creating localised hotspots. Monitoring wind patterns is crucial; winds from the south-east may bring pollutants from more industrialised areas. Avoiding outdoor exercise during peak agricultural activity in the dry season is advisable.