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Mantena, nestled in the southeastern Brazilian state of Minas Gerais, occupies a unique geographic position within a landscape dominated by rolling hills and the beginnings of the Doce River basin. Located at coordinates -18.7819, -40.9800, the city sits at an elevation of approximately 240 meters, influencing local air circulation patterns. The surrounding terrain is characterised by a mix of agricultural land – primarily coffee and cattle farming – and remnants of the Atlantic Forest, though deforestation has altered the natural landscape significantly. Mantena’s position isn’t directly within a major industrial belt, but it’s downstream from areas with mining activity, potentially impacting water and, consequently, air quality through dust and runoff. The urban-rural gradient is relatively sharp; the city centre is densely populated, transitioning quickly to rural areas dedicated to agriculture. This proximity to agricultural practices introduces potential sources of particulate matter from burning biomass for land clearing and fertilizer application. The Doce River, while a vital resource, has suffered from pollution events in recent years, indirectly affecting local air quality through evaporation and potential aerosol formation. The valley location can also trap pollutants during periods of atmospheric stability, exacerbating air quality issues. Understanding these geographical factors is crucial for assessing and mitigating air pollution in Mantena.

Mantena experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, typically from April to September, sees significantly reduced rainfall and increased dust levels, particularly from agricultural activities and unpaved roads. This period often coincides with increased burning for land preparation, leading to spikes in particulate matter (PM2.5 and PM10). August and September are generally the months with the poorest air quality. Conversely, the wet season, from October to March, brings frequent rainfall that effectively washes away pollutants, improving air quality considerably. However, the increased humidity can also foster the growth of molds and fungi, potentially triggering respiratory issues. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near the ground, worsening conditions. Wind patterns, generally from the east, can transport pollutants from upstream areas. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry season, especially on days with visible haze. Monitoring weather forecasts and avoiding strenuous exercise during peak pollution periods is advisable. The transition months of March and October can be unpredictable, requiring vigilance.