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Monte Alegre de Minas, nestled within the southern reaches of Minas Gerais, Brazil, occupies a geographically significant position within the broader Southeast region. Located at approximately -18.8708° latitude and -48.8808° longitude, the city’s terrain is characterized by undulating hills and valleys typical of the Serra da Mantiqueira foothills. The elevation, averaging around 800-900 meters above sea level, contributes to a cooler climate compared to lower-lying areas of Minas Gerais, but also influences atmospheric stability and potential for temperature inversions. The surrounding landscape is a mosaic of agricultural land, primarily dedicated to coffee cultivation and cattle ranching, interspersed with patches of native Cerrado vegetation. This agricultural activity, while vital to the local economy, can contribute to localized air pollution through the use of fertilizers, pesticides, and emissions from agricultural machinery. The urban–rural gradient transitions relatively smoothly, with smaller settlements and farms dotting the landscape surrounding Monte Alegre de Minas. While not directly adjacent to major rivers, the region benefits from groundwater resources and occasional rainfall runoff, impacting local humidity levels. The city’s regional position, away from major industrial belts concentrated further east, generally shields it from large-scale industrial pollution. However, the prevalence of wood-burning stoves for heating and cooking, particularly in older residential areas, represents a consistent source of particulate matter. The topography, combined with prevailing wind patterns, can trap pollutants, especially during periods of low wind speed, impacting local air quality.

Monte Alegre de Minas experiences a tropical savanna climate, characterized by distinct wet and dry seasons rather than the four traditional seasons. The dry season, typically spanning from April to September, often sees a noticeable decline in air quality. Reduced rainfall leads to lower atmospheric moisture, increasing the concentration of particulate matter, particularly from wood-burning activities. Temperature inversions are more frequent during this period, trapping pollutants close to the ground, especially in the mornings and evenings. The months of July and August often present the most challenging conditions for air quality. Conversely, the wet season, from October to March, brings increased rainfall and higher humidity, naturally cleansing the atmosphere and dispersing pollutants. Stronger winds associated with convective storms also help to ventilate the region. However, heavy rainfall can occasionally lead to increased levels of mold spores and pollen, impacting individuals with respiratory sensitivities. During the wet season, outdoor activities are generally more favorable, although periods of dense fog can temporarily reduce visibility and trap moisture. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, limiting prolonged outdoor exposure and avoiding strenuous activity during peak pollution periods. Maintaining indoor air quality through proper ventilation and air filtration can also provide relief. The agricultural cycle also influences air quality; burning of agricultural waste after harvest can temporarily elevate particulate matter levels, typically occurring in late September and October.