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Carmo do Paranaíba, nestled in the southwestern region of Minas Gerais, Brazil, occupies a unique geographic position within the Cerrado biome. The city sits at an elevation of approximately 820 meters (2,690 feet), contributing to a moderate climate influenced by altitude. The surrounding landscape is characterized by rolling hills and plateaus, typical of the Brazilian Highlands, interspersed with gallery forests along the numerous tributaries of the Paranaíba River. This river, a major waterway in the region, significantly influences local humidity and potential for atmospheric moisture. While not heavily industrialized, Carmo do Paranaíba is surrounded by extensive agricultural zones, primarily dedicated to soybean, corn, and sugarcane cultivation. This agricultural activity is a key factor influencing air quality, with seasonal burning practices for land preparation releasing particulate matter. The urban-rural gradient is relatively sharp, with the city centre transitioning quickly to agricultural land. The terrain, while not mountainous, can create localized microclimates and influence wind patterns, affecting pollutant dispersion. Dust from unpaved roads and agricultural activities also contributes to particulate matter concentrations, particularly during the dry season. The city’s location, away from major industrial belts, offers some protection, but agricultural emissions remain a primary concern.

Carmo do Paranaíba experiences a distinct wet and dry season, heavily influencing air quality. The dry season, typically from May to September, sees a significant increase in particulate matter due to agricultural burning for planting and harvesting. Lower humidity and reduced rainfall mean pollutants are less effectively washed from the atmosphere, leading to poorer air quality. August and September are often the most challenging months for respiratory health. Conversely, the wet season, from October to April, brings relief. Increased rainfall effectively scrubs the air, reducing particulate matter concentrations. However, even during the wet season, localized pollution can occur from vehicle emissions and dust from unpaved roads. November and December generally offer the best air quality. Temperature inversions, common during cooler nights, can trap pollutants near the ground, exacerbating conditions even during the wet season. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during the dry season and be mindful of air quality on cooler evenings. Monitoring wind patterns is crucial, as winds from agricultural areas can quickly degrade air quality in the city centre.