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Iacanga, nestled within the São Paulo state of Brazil, occupies a geographically significant position within the broader Campinas metropolitan region. Located at approximately -21.8900 latitude and -49.0247 longitude, the city’s terrain is characterized by gently undulating hills, typical of the Serra do Mar foothills, influencing local wind patterns and drainage. The surrounding landscape is a mosaic of agricultural land, primarily sugarcane and citrus plantations, interspersed with smaller rural settlements and patches of Atlantic Forest remnants. This proximity to intensive agriculture contributes to localized air quality concerns, particularly related to pesticide drift and biomass burning during harvest seasons. Iacanga’s elevation, while modest, creates a microclimate where temperature inversions can occasionally occur, trapping pollutants closer to the ground. The city sits relatively far from major rivers, though smaller streams and tributaries feed into the wider Tietê River basin, impacting regional water quality which, in turn, can influence atmospheric particulate matter. The urban–rural gradient is relatively sharp, with Iacanga transitioning quickly from a small, primarily residential community to agricultural fields. Its location within the Campinas industrial belt, though not directly adjacent to heavy industry, means it is susceptible to pollutants transported from larger urban centers and industrial zones, particularly during periods of stagnant air. The prevailing winds generally flow from the west, carrying potential pollutants from the interior towards the coastal areas, impacting Iacanga’s air quality profile.

Iacanga’s tropical climate dictates a distinct wet and dry season pattern, profoundly influencing its air quality throughout the year. The dry season, typically spanning from April to September, often witnesses a concerning rise in particulate matter. This is largely attributable to agricultural practices; controlled burns of sugarcane fields are common during this period, releasing significant quantities of smoke and ash into the atmosphere. Reduced rainfall and lower humidity during these months exacerbate the situation, as pollutants linger longer and are less effectively washed away. Temperature inversions are also more frequent during the dry season, trapping pollutants near the surface. Conversely, the wet season (October to March) brings increased rainfall and higher humidity, naturally cleansing the air and reducing particulate concentrations. However, heavy rainfall can also lead to increased levels of ozone, a secondary pollutant formed through photochemical reactions involving nitrogen oxides and volatile organic compounds, particularly on sunny days following rainfall. The months of August and September are generally the most challenging for air quality due to peak agricultural burning. Individuals with respiratory conditions, such as asthma, and the elderly should exercise caution during these periods, limiting outdoor exertion and monitoring local air quality reports. During the wet season, while overall air quality improves, those sensitive to pollen or mold spores should remain vigilant, as increased humidity can promote their growth and dispersal. Maintaining indoor air quality through proper ventilation and air purification can be beneficial year-round.