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Boa Esperança do Sul, nestled within the São Paulo state of Brazil, occupies a geographically significant position within the broader Southeast region. Located at approximately -21.9925° latitude and -48.3908° longitude, the city’s terrain is characterized by gently undulating plains, typical of the Cerrado biome’s transition zone into the Atlantic Forest. The surrounding landscape is a mosaic of agricultural fields – primarily soybean and maize cultivation – interspersed with patches of native Cerrado vegetation, contributing to a distinct urban–rural gradient. While not directly adjacent to major rivers, the region experiences seasonal rainfall that feeds smaller tributaries and groundwater reserves. Boa Esperança do Sul’s elevation, averaging around 650 meters above sea level, influences local weather patterns and can contribute to temperature inversions, particularly during the drier months. Its proximity to the larger industrial belt of São Paulo, though not immediately within it, means it’s susceptible to long-range transport of pollutants. The city’s relatively small population (15,018) suggests a primarily agricultural economy, with limited heavy industry within its immediate boundaries. However, the reliance on agricultural machinery and potential fertilizer use, combined with the regional transport of pollutants from larger urban centers, collectively shape the city’s air quality profile. The prevailing winds, generally from the east during the wet season, play a crucial role in dispersing or concentrating airborne particles, impacting local air quality conditions.

Boa Esperança do Sul’s air quality follows a distinct seasonal pattern dictated by its tropical climate. The wet season, typically spanning from October to March, brings increased rainfall and higher humidity, generally leading to improved air quality as precipitation washes away particulate matter. Winds are often more consistent during this period, aiding in pollutant dispersion. However, agricultural activities intensify during this time, potentially releasing ammonia from fertilizers and contributing to localized air quality concerns. The dry season, from April to September, presents a different scenario. Reduced rainfall and lower humidity create conditions conducive to the formation of temperature inversions, where a layer of warm air traps cooler air near the ground, preventing the vertical mixing of pollutants. This phenomenon can lead to stagnant air and a build-up of particulate matter and other emissions. Dust from agricultural fields, particularly during harvesting, also contributes to elevated levels. Months like August and September often experience the most persistent inversions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during these periods, limiting outdoor exertion and monitoring for any adverse health effects. While the wet season generally offers respite, periods of intense agricultural activity can still impact local air quality. The interplay of wind patterns, temperature fluctuations, and agricultural practices creates a dynamic air quality landscape throughout the year.