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Martinópolis, nestled within the state of São Paulo, Brazil, occupies a geographically significant position in the southern portion of the state, approximately 450 kilometers west of the major metropolis of São Paulo City. Its coordinates, -22.1461, -51.1709, place it within a gently undulating terrain characteristic of the Paraná River basin. The city’s elevation averages around 520 meters above sea level, contributing to a relatively mild climate, but also influencing local air circulation patterns. The surrounding landscape is predominantly agricultural, with extensive soybean, corn, and sugarcane plantations dominating the rural areas. This agricultural activity, while vital to the regional economy, introduces potential sources of particulate matter and volatile organic compounds into the atmosphere, particularly during harvest seasons. To the east, the landscape gradually transitions to more forested areas, offering some natural air filtration. The urban–rural gradient around Martinópolis is relatively smooth, with smaller settlements and agricultural holdings interspersed throughout the region. The city itself exhibits a typical Brazilian small-city character, with a central commercial area and residential zones radiating outwards. While Martinópolis isn't directly adjacent to major rivers, it benefits from groundwater resources. The absence of large-scale industrial zones within the city limits mitigates some pollution risks, however, the proximity to larger industrial belts further east, within the São Paulo state, means that pollutants can be transported via prevailing winds, impacting local air quality. The topography, combined with agricultural practices and regional wind patterns, creates a complex interplay affecting air quality in Martinópolis.

Martinópolis experiences a tropical savanna climate, characterized by distinct wet and dry seasons, significantly influencing its air quality profile. The dry season, typically spanning from April to September, often sees a noticeable increase in particulate matter concentrations. This is largely attributable to increased agricultural burning, a common practice for land clearing and crop residue removal. The drier air and reduced rainfall during this period also limit the natural cleansing effect of precipitation, allowing pollutants to persist longer. Temperature inversions, where cooler air becomes trapped beneath a layer of warmer air, are more frequent during the dry season, particularly in the mornings, hindering vertical mixing and concentrating pollutants near ground level. Conversely, the wet season (October to March) brings increased rainfall and higher humidity, which naturally washes away particulate matter and helps dilute gaseous pollutants. Stronger winds associated with occasional thunderstorms also aid in dispersing pollutants. The months of August and September, coinciding with peak agricultural burning, are generally periods to avoid strenuous outdoor activity, especially for individuals with respiratory sensitivities. During the wet season, air quality tends to be better, but periods of dense fog, particularly in the early mornings, can temporarily reduce visibility and trap pollutants. Sensitive groups, including children, the elderly, and those with pre-existing respiratory conditions, should monitor local air quality reports and limit outdoor exposure during periods of elevated particulate matter, regardless of the season. Maintaining green spaces within the city and promoting sustainable agricultural practices are crucial for mitigating air pollution impacts.