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Capelinha is nestled within the lush expanse of the Mucuri Valley in northeastern Minas Gerais, characterized by an undulating landscape that blends the Atlantic Forest's biodiversity with vast agricultural stretches. Positioned as a regional hub, the city's urban character is a compact grid surrounded by rolling hills and verdant plateaus, which significantly influence its local microclimate. The elevation creates a natural basin effect, where the surrounding highlands can occasionally trap air masses, limiting the horizontal dispersion of pollutants. This terrain is integral to the city's air quality profile, as the urban–rural gradient is sharp; the town center transitions quickly into coffee plantations and cattle pastures. While Capelinha lacks a dense industrial belt, the proximity to these agricultural zones introduces specific atmospheric challenges, such as the prevalence of particulate matter from soil tilling and organic decomposition. The region is intersected by small tributaries that feed the Mucuri River basin, providing essential moisture that helps scrub the air during humid periods. However, the interplay between the valley's topography and the prevailing winds often results in stagnant air pockets during the cooler months. This geographic positioning makes the city susceptible to localized smog during periods of low wind speed, where domestic emissions from wood-burning stoves and vehicle exhaust accumulate. Consequently, the physical layout of Capelinha acts as both a scenic sanctuary and a meteorological trap, defining the rhythmic ebb and flow of its atmospheric purity.

In Capelinha, the air quality narrative is dictated by the stark contrast between the tropical wet and dry seasons. During the summer months, from December to March, heavy precipitation and high humidity act as natural filtration systems, washing particulate matter from the sky and maintaining high air purity. This is the ideal period for outdoor activities, as the frequent rain prevents the accumulation of pollutants. Conversely, the winter season, spanning June to September, brings a period of prolonged aridity and lower temperatures. This dry window is when air quality typically deteriorates, driven by the prevalence of biomass burning. Farmers often clear land using fire, releasing plumes of smoke and fine particulate matter that linger in the valley due to frequent temperature inversions. These inversions act as a lid, trapping pollutants near the surface and increasing the risk of respiratory distress. Fog is also common in the early mornings, which can encapsulate pollutants in a dense haze. Sensitive groups, including children, the elderly, and those with asthma, should limit strenuous outdoor exercise during the peak dry months of August and September. To mitigate health risks, residents are encouraged to monitor local visibility and avoid outdoor exertion during the height of the burning season. By understanding this meteorological cycle, the community can better navigate the seasonal shifts, favoring the refreshing rains of January over the stagnant, smoky air of the winter solstice.