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Santo Antônio do Monte, nestled in the Serra da Mantiqueira mountain range of Minas Gerais, Brazil, occupies a geographically significant position within the southeastern region. Located at approximately -20.0869 latitude and -45.2939 longitude, the city’s elevation averages around 1,200 meters (3,937 feet) above sea level, contributing to a cooler climate compared to lower-lying areas of Minas Gerais. The surrounding landscape is dominated by rolling hills, dense Atlantic Forest remnants, and steep slopes characteristic of the Mantiqueira range. This terrain significantly influences local air circulation patterns; valleys can trap pollutants, while higher elevations experience greater dispersion. The city’s urban character is primarily residential, with a relatively low population density of 27,295, suggesting a more rural feel despite its municipal status. While not directly adjacent to major rivers, Santo Antônio do Monte benefits from several smaller streams and springs originating in the surrounding mountains, contributing to local humidity. The region is a mix of small-scale agriculture (coffee, fruits, and vegetables) and cattle ranching, with some artisanal mining activity historically present in the broader Mantiqueira region. The urban–rural gradient is gradual, with agricultural land and forested areas closely bordering the city limits. This proximity to agricultural zones means that seasonal agricultural practices, such as burning for land clearing (though increasingly regulated), can impact local air quality. The mountainous terrain and Atlantic Forest influence local weather patterns, often leading to fog and reduced sunlight, which can also affect pollutant dispersion.

Santo Antônio do Monte experiences a tropical highland climate, characterized by distinct wet and dry seasons rather than the four traditional seasons. The dry season, typically from April to September, often sees a slight increase in particulate matter concentrations. This is partly due to reduced rainfall, which limits the natural cleansing effect of precipitation, and a greater reliance on wood-burning stoves for heating in the cooler, higher-altitude environment. Temperature inversions, common during the dry season, can trap pollutants in the valleys, exacerbating the issue. The wet season, from October to March, brings frequent rainfall and higher humidity, generally leading to improved air quality as pollutants are washed from the atmosphere. However, periods of intense rainfall can also lead to soil erosion and increased dust levels, temporarily impacting air quality. Fog, a frequent occurrence due to the mountainous terrain and humidity, can also trap pollutants, particularly during the dry season mornings. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should be particularly cautious during the dry months (June-August), limiting outdoor activities during periods of stagnant air. Agricultural burning, though regulated, can still occur during the transition periods between wet and dry seasons, creating localized air quality concerns. The increased humidity during the wet season can also promote the growth of mold and mildew, which can affect indoor air quality and trigger allergic reactions. Overall, while Santo Antônio do Monte generally enjoys relatively good air quality, awareness of seasonal variations and meteorological factors is crucial for protecting public health.