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Campinas occupies a strategic position in southeastern Brazil's interior plateau, approximately 100 kilometers northwest of São Paulo city, within the fertile heartland of São Paulo state. Situated at an average elevation of 680 meters above sea level, the city rests on the Brazilian Highlands, which provides some natural ventilation but also creates conditions for temperature inversions that can trap pollutants. The urban area is characterized by a distinct urban-rural gradient, transitioning from dense commercial and residential zones in the center to expanding suburban neighborhoods and eventually to the surrounding agricultural belt that dominates the region. This agricultural periphery—notably sugarcane plantations and orange groves—contributes biogenic emissions and occasional agricultural burning that interact with urban pollution. The city lies within the Piracicaba River basin, with several smaller waterways like the Atibaia River flowing through the metropolitan area, though these water bodies provide minimal dispersion effect for air pollutants. Campinas functions as a major technological and industrial hub—often called Brazil's 'Silicon Valley'—with significant automotive, pharmaceutical, and technology sectors concentrated in industrial districts like the Campinas Technology Park and the Anhumas industrial area. The city's location along major transportation corridors, including the Bandeirantes and Anhanguera highways connecting it to São Paulo and other industrial centers, results in substantial vehicular emissions. The surrounding landscape of rolling hills and plateaus can channel or block wind patterns, while the absence of significant mountain barriers allows some pollutant transport toward the interior, though the urban heat island effect in the densely built core frequently creates localized air stagnation.

Campinas experiences distinct seasonal air quality patterns influenced by its subtropical climate with dry winters and rainy summers. During summer (December to February), increased rainfall and convective activity help disperse pollutants, making this period generally favorable for outdoor activities despite occasional high ozone levels from intense sunlight interacting with vehicle emissions. Autumn (March to May) sees gradually decreasing precipitation, with lingering agricultural burning from sugarcane harvests in the surrounding countryside contributing to particulate matter spikes, particularly in April and May as farmers clear fields. Winter (June to August) brings the most challenging air quality conditions, characterized by frequent temperature inversions that trap pollutants close to the ground, combined with low wind speeds and reduced rainfall. These meteorological conditions, exacerbated by increased biomass burning for heating in some areas and stable atmospheric layers, make July and August the peak pollution months when sensitive groups should limit prolonged outdoor exposure. Spring (September to November) marks a transition period with increasing rainfall and wind patterns that gradually improve dispersion, though occasional early-season agricultural fires can cause temporary deteriorations. Throughout the year, sensitive populations including those with respiratory conditions, children, and older adults should monitor local air quality reports, with particular caution advised during winter mornings when inversion layers are strongest and pollutant concentrations peak. The city's urban heat island effect can intensify ozone formation during sunny afternoons in warmer months, suggesting midday precautions for those engaging in vigorous outdoor activities.