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Bom Repouso, nestled in the heart of Minas Gerais, Brazil, occupies a unique geographic position within a landscape defined by rolling hills and the beginnings of the Serra da Mantiqueira mountain range. Situated at coordinates -22.4708, -46.1450, the city’s elevation contributes to cooler temperatures than many other parts of Minas Gerais, but also influences air dispersion patterns. The surrounding terrain is predominantly agricultural, with coffee plantations and pastureland dominating the rural areas immediately bordering the urban centre. This agricultural activity, while vital to the local economy, introduces potential sources of particulate matter from field preparation and biomass burning. The city itself is relatively small, with a population of approximately 12,649, exhibiting a typical Brazilian small-city urban form – a concentrated central area surrounded by lower-density residential zones. Bom Repouso isn’t directly adjacent to major bodies of water, though smaller rivers and streams crisscross the region, influencing local humidity. The urban-rural gradient is fairly sharp, with agricultural land quickly transitioning to denser settlement. While not a major industrial hub, regional transport routes pass nearby, potentially contributing to vehicular emissions. The valley location can trap pollutants during periods of atmospheric stability, impacting local air quality.

Bom Repouso experiences a distinct wet and dry season, rather than traditional four seasons. Air quality generally improves during the wet season (October to April) due to increased rainfall which effectively washes particulate matter from the atmosphere and suppresses dust. However, increased humidity can also contribute to the formation of secondary pollutants. The driest months, May through September, consistently present the poorest air quality. This is largely due to increased agricultural burning for land preparation and harvesting, releasing significant amounts of smoke and particulate matter. Temperature inversions are common during the cooler, drier mornings, trapping pollutants near ground level. August and September are particularly challenging months. Winds are generally light throughout the year, offering limited natural dispersion. Sensitive groups – children, the elderly, and individuals with respiratory conditions – should limit strenuous outdoor activity during these peak pollution periods. Fog, common in the mornings, can exacerbate respiratory issues by trapping pollutants. Monitoring local conditions and avoiding outdoor exertion during periods of visible haze is crucial. The transition months, April and October, offer the most favourable conditions for outdoor activities.