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Aguaí, nestled in the state of São Paulo, Brazil, occupies a gently undulating terrain within the broader landscape of the Serra da Mantiqueira foothills. Located at coordinates -22.0603, -46.9736, the city sits at an elevation of approximately 830 meters (2,723 feet), influencing its microclimate and air circulation patterns. The surrounding region is characterized by a mosaic of agricultural land, primarily sugarcane and coffee plantations, interspersed with remnants of Atlantic Forest. This agricultural dominance is a key factor in local air quality, with seasonal burning practices contributing to particulate matter. Aguaí’s position isn’t directly adjacent to large bodies of water, though several smaller rivers and streams traverse the municipality, influencing local humidity. The urban-rural gradient is relatively sharp; the city centre is compact, quickly transitioning to rural landscapes. While not situated within a major industrial belt, the proximity to larger industrial centres within São Paulo state means long-range transport of pollutants is possible. Topography plays a role, potentially creating localized pockets of stagnant air, especially during calmer weather conditions. The prevailing winds, generally from the southeast, can either disperse or concentrate pollutants depending on the season and atmospheric stability. Understanding this interplay of geography and land use is crucial for assessing and mitigating air quality challenges in Aguaí.

Aguaí experiences a humid subtropical climate, with distinct wet and dry seasons rather than traditional four seasons. Air quality generally improves during the wet season (October to April) due to rainfall effectively scavenging pollutants from the atmosphere. However, increased humidity can also foster mold growth, impacting respiratory health. The dry season (May to September) presents the greatest air quality concerns. This period coincides with agricultural burning for sugarcane harvesting, leading to significant spikes in particulate matter, particularly PM2.5 and PM10. Temperature inversions are common during the cooler, drier months, trapping pollutants near the ground. August and September are typically the months with the poorest air quality. Winds are generally weaker during this time, reducing dispersion. Sensitive groups – children, the elderly, and individuals with pre-existing respiratory conditions – should limit strenuous outdoor activity during these months. Conversely, the wetter months, particularly November and December, offer the most favourable conditions for outdoor exercise. Fog can occur during cooler mornings, potentially exacerbating respiratory issues. Monitoring local conditions and heeding health advisories is vital throughout the year, but especially during the dry season.