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Mirassol d’Oeste, nestled in the heart of Mato Grosso, Brazil, occupies a unique geographic position within the Cerrado biome. Located at -15.6750, -58.0958, the city sits on relatively flat terrain, typical of the region, with an elevation around 350 meters. This low relief contributes to potential air stagnation, particularly during drier periods. The surrounding landscape is dominated by expansive agricultural lands, primarily soybean and cattle ranching, which significantly influences the local air quality. While not immediately adjacent to major waterways, the city is within the broader Amazon basin, and its climate is affected by moisture transport from this region. The urban-rural gradient is pronounced; Mirassol d’Oeste is a relatively small city, and agricultural activities directly border residential areas. This proximity means that seasonal burning for land preparation, a common practice in the Cerrado, directly impacts air quality within the city limits. The lack of significant industrial belts within Mirassol d’Oeste itself means that agricultural emissions are the dominant pollution source. The prevailing winds, generally from the east, can transport pollutants from further afield, while local wind patterns can exacerbate or disperse emissions from nearby farms. Understanding this interplay between land use, topography, and meteorology is crucial for assessing and mitigating air pollution in Mirassol d’Oeste.

Mirassol d’Oeste experiences a distinct wet and dry season, heavily influencing air quality. The dry season, typically from May to September, presents the most challenging conditions. During this period, agricultural burning for land clearing intensifies, releasing substantial particulate matter (PM2.5 and PM10) and other pollutants. Low humidity and stable atmospheric conditions during these months exacerbate pollution, trapping smoke close to the ground. August and September are often the worst months for air quality, with increased respiratory issues reported. The transition to the wet season, from October to April, brings relief. Rainfall effectively suppresses burning and washes pollutants from the atmosphere. November and December see a significant improvement in air quality, though localized smoke from smaller burns can still occur. However, the increased humidity can also promote the formation of mold and allergens, impacting sensitive individuals. February and March, the peak of the wet season, generally offer the cleanest air. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry season, particularly in August and September. Staying indoors with windows closed and using air purifiers are recommended during peak pollution periods. Monitoring local fire reports is also advisable.