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Peçanha, nestled in the heart of Minas Gerais, Brazil, presents a unique geographic context influencing its air quality. Situated at coordinates -18.5489, -42.5569, the city occupies a position within a gently undulating landscape characteristic of the Brazilian Highlands. The terrain is not dramatically mountainous, but features rolling hills and valleys carved by numerous small streams feeding into the nearby Rio São João. Elevation plays a role, with Peçanha sitting at approximately 750 meters above sea level, which can contribute to temperature inversions. The surrounding region is a mosaic of agricultural land – primarily cattle ranching and some smaller-scale crop cultivation – and remnants of the Atlantic Forest. While not directly within a major industrial belt, the broader Minas Gerais state is heavily mineral-rich, and transport routes for mining products pass through the region, potentially contributing to particulate matter. The urban-rural gradient is relatively sharp; Peçanha itself is a comparatively small city of around 17,446 inhabitants, surrounded by extensive rural areas. This proximity to agricultural activities introduces potential sources of ammonia and dust, while the limited industrial presence means localised emissions are less dominant than regional transport impacts. The city’s location within a valley can also trap pollutants during calm weather conditions.

Peçanha experiences a distinct wet and dry season, rather than traditional four seasons. Air quality in Peçanha is most compromised during the dry season, typically from May to September. This period sees reduced rainfall, leading to the accumulation of dust and particulate matter from agricultural activities and unpaved roads. Lower humidity also means pollutants are less likely to be washed out of the atmosphere. Temperature inversions, common during cooler nights in the dry season, exacerbate the problem by trapping pollutants near ground level. October and November bring the transition to the wet season, with increasing rainfall gradually improving air quality. The wet season, from December to April, generally offers the best air quality, as rainfall effectively cleanses the atmosphere. However, even during the wet season, periods of calm weather can lead to localised pollutant build-up. Sensitive groups – children, the elderly, and those with respiratory conditions – should be particularly cautious during the dry months. Fog, common in the mornings during the transition seasons, can also trap pollutants. Avoiding strenuous outdoor activity during peak dry season afternoons and monitoring personal health are recommended. The prevailing winds, generally from the east, can transport pollutants from agricultural burning further afield.