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Jequitinhonha, nestled in the northern reaches of Minas Gerais, Brazil, occupies a challenging geographic position within the expansive São Francisco River basin. The city sits at an elevation of approximately 820 meters (2,690 feet), contributing to a relatively cool climate for a tropical latitude. The surrounding landscape is characterized by the rugged Serra do Espinhaço mountain range, a significant geological feature influencing local wind patterns and creating pockets of atmospheric stagnation. Jequitinhonha itself is situated in a valley, a common feature in this region, which can exacerbate pollution build-up due to limited atmospheric dispersion. The Jequitinhonha River, after which the city is named, flows nearby, but its water quality is often compromised by upstream agricultural runoff and mining activities. While not a major industrial hub, the region supports substantial agricultural activity, primarily subsistence farming and cattle ranching, contributing to particulate matter from land preparation and biomass burning. The urban-rural gradient is sharp; the city centre is densely populated, transitioning quickly to sparsely populated rural areas. This proximity to agricultural lands and the valley location are key factors influencing Jequitinhonha’s air quality, making it susceptible to both locally generated and transported pollutants. The terrain’s complexity hinders consistent wind flow, trapping pollutants during calm periods.

Jequitinhonha experiences a distinct wet and dry season, heavily influencing air quality. The dry season, typically from May to September, sees significantly reduced rainfall and increased dust resuspension from agricultural lands and unpaved roads, leading to higher particulate matter concentrations. This period is also associated with increased biomass burning for land clearing, further degrading air quality. August and September are generally the months with the poorest air quality, posing risks to those with respiratory conditions. Conversely, the wet season, from October to April, brings relief through rainfall which effectively washes away pollutants. However, even during the wet season, localized pollution events can occur due to stagnant air masses trapped by the surrounding mountains. November and December often experience increased humidity and fog, potentially trapping pollutants near the ground. Temperature inversions, common during the cooler nights of the dry season, exacerbate pollution by preventing vertical mixing of the atmosphere. Sensitive groups – children, the elderly, and individuals with pre-existing respiratory or cardiovascular diseases – should limit strenuous outdoor activity during the dry season and monitor their health closely. The transition months of April and October can be unpredictable, requiring vigilance.