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Pirapora do Bom Jesus, nestled within the São Paulo state of Brazil, occupies a geographically significant position within the broader Southeast region. Located at approximately -23.3972 latitude and -47.0028 longitude, the city’s terrain is characterized by gently undulating hills typical of the Serra da Mantiqueira foothills, contributing to a modest average elevation of around 750 meters above sea level. This elevation influences local weather patterns and, consequently, air quality. The surrounding landscape is a mosaic of agricultural lands – primarily sugarcane and cattle pastures – interspersed with patches of remnant Atlantic Forest, a biome increasingly fragmented across São Paulo. The urban–rural gradient is relatively sharp; Pirapora do Bom Jesus maintains a distinctly rural character, with agriculture dominating the immediate periphery. While not directly adjacent to major rivers, the city benefits from proximity to smaller tributaries feeding into larger river systems, impacting regional humidity and potential for fog formation. Its location, roughly 450 kilometers northwest of São Paulo city, places it outside the immediate industrial belt, but still within reach of agricultural processing facilities and transportation corridors. The prevailing winds, generally flowing from the west, carry agricultural emissions and dust, while the topography can trap pollutants, particularly during periods of atmospheric stability. The limited urban density minimizes localized pollution from vehicular traffic, but the reliance on biomass for heating and cooking in some households contributes to particulate matter emissions. The surrounding agricultural practices, including burning for land clearing (though increasingly regulated), represent a key factor influencing regional air quality.

Pirapora do Bom Jesus experiences a tropical savanna climate, characterized by a distinct wet and dry season rather than four traditional seasons. The dry season, typically spanning from April to September, presents the most significant air quality challenges. Reduced rainfall leads to lower atmospheric moisture, increasing the concentration of particulate matter, particularly dust originating from agricultural fields and unpaved roads. The lack of rainfall also diminishes the natural cleansing effect of precipitation. Temperature inversions are more frequent during this period, trapping pollutants near the ground, especially in the mornings. Agricultural burning, though regulated, can still occur, exacerbating particulate pollution. The wet season, from October to March, brings increased rainfall and higher humidity, naturally dispersing pollutants and improving air quality. However, heavy rainfall can also lead to increased soil erosion and dust events, temporarily impacting air quality. Fog, common during the cooler months of the dry season, further concentrates pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural activity or when visibility is reduced due to fog. Outdoor activities are generally more favorable during the wet season, although vigilance regarding potential dust events following heavy rainfall is advised. The combination of dry conditions, temperature inversions, and agricultural practices creates a predictable cycle of air quality fluctuations throughout the year, demanding proactive mitigation strategies.