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Canarana, Bahia, Brazil, occupies a strategic position within the Cerrado biome, a vast tropical savanna ecoregion dominating much of Brazil’s interior. Located at approximately -11.6850° latitude and -41.7689° longitude, the city sits at a modest elevation of around 350 meters above sea level, contributing to a relatively mild climate. The surrounding landscape is characterized by undulating plains punctuated by gallery forests along ephemeral streams and rivers, typical of the Cerrado. Canarana’s regional position is significant; it lies within a crucial agricultural zone, primarily dedicated to soybean and maize cultivation, alongside cattle ranching. This agricultural intensity introduces potential sources of air pollution, particularly from fertilizer application and livestock emissions. The urban–rural gradient transitions rapidly, with agricultural fields and pastureland immediately bordering the city limits. While not directly adjacent to a major river, the city relies on groundwater and seasonal streams, influencing local humidity and potentially affecting pollutant dispersion. The terrain, generally flat, can sometimes exacerbate air stagnation, especially during periods of low wind. The absence of significant industrial belts within Canarana itself reduces direct industrial emissions, but the transport of agricultural products via road networks introduces vehicular pollution. The Cerrado’s characteristic dry season, coupled with the prevalence of open burning for land clearing and agricultural practices, represents a key factor influencing regional air quality, impacting Canarana’s atmosphere.

Canarana experiences a distinct tropical wet and dry season, profoundly shaping its air quality profile. The dry season, typically spanning from May to September, is characterized by reduced rainfall, higher temperatures, and a significant increase in open burning associated with agricultural land preparation. This period invariably witnesses elevated particulate matter concentrations, stemming from smoke plumes and fugitive dust. Meteorological conditions during the dry season often feature stable atmospheric layers and weaker winds, promoting pollutant accumulation and hindering dispersion. Temperature inversions, common during cooler nights, trap pollutants near the ground, further worsening air quality. The wet season, from October to April, brings increased rainfall and higher humidity, naturally cleansing the atmosphere and reducing particulate matter. However, periods of intense rainfall can also lead to increased soil erosion and dust resuspension, temporarily impacting air quality. Fog, though infrequent, can occur during the transition months, trapping pollutants and reducing visibility. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak burning periods. The months of August and September often present the most challenging air quality conditions. During the wet season, while generally cleaner, periods of heavy rain and subsequent drying can trigger dust events. Maintaining indoor air quality through proper ventilation and air filtration is advisable year-round, particularly during periods of elevated pollution.