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Araçoiaba da Serra, nestled in the state of São Paulo, Brazil, occupies a unique geographic position within a gently undulating landscape. Located at coordinates -23.5053, -47.6142, the city’s terrain is characterised by rolling hills and valleys, typical of the region’s interior plateau. The elevation, averaging around 650 meters above sea level, influences local weather patterns and contributes to the potential for temperature inversions, trapping pollutants. The city is not directly adjacent to large bodies of water, though several smaller rivers and streams crisscross the municipality, providing vital freshwater resources but also potentially acting as conduits for agricultural runoff. Surrounding Araçoiaba da Serra is a mosaic of agricultural land, primarily sugarcane and pasture, alongside patches of remaining Atlantic Forest. This blend of land use is crucial for understanding air quality. The urban-rural gradient is relatively sharp; the city centre represents a concentrated source of emissions from vehicle traffic and small-scale industries, while the surrounding rural areas contribute particulate matter from agricultural activities like burning and soil disturbance. The proximity to larger industrial centres further afield in São Paulo state means long-range transport of pollutants is also a factor, impacting baseline air quality. The city’s location within a valley can exacerbate pollution build-up during calm weather conditions.

Araçoiaba da Serra experiences a distinct wet and dry season, rather than traditional four seasons. Air quality generally improves during the wet season (October to March) due to increased rainfall which effectively washes particulate matter from the atmosphere and suppresses dust. The higher humidity also reduces the likelihood of wildfires, a significant source of smoke pollution. However, the wet season can also bring increased fungal spores, potentially impacting respiratory health. The dry season (April to September) consistently presents poorer air quality. Lower rainfall leads to increased dust from agricultural lands and unpaved roads. Calm winds during this period exacerbate the problem, allowing pollutants to accumulate. Temperature inversions, common in the mornings, trap pollutants near ground level. August and September are typically the worst months for air quality, coinciding with peak sugarcane burning activity. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during these months. Monitoring wind direction is crucial; winds from the south and southwest often carry pollutants from more industrialised areas. Fog, common in the cooler mornings, can also trap pollutants, reducing visibility and increasing respiratory irritation.