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Pontes e Lacerda, nestled in the southwestern region of Mato Grosso, Brazil, occupies a unique geographic position within the Cerrado biome. Situated at approximately -15.2258 latitude and -59.3350 longitude, the city lies on the border with Bolivia, making it a crucial regional hub. The terrain is characterized by gently undulating plains, typical of the Cerrado, transitioning into slightly more rugged landscapes as one moves further from the Paraguay River. This river is a dominant feature, influencing local climate and providing a vital transportation corridor. The urban area itself is relatively compact, exhibiting a typical Brazilian pattern of a central core surrounded by expanding residential zones. A significant portion of the surrounding landscape is dedicated to extensive cattle ranching and increasingly, soybean cultivation, representing a major agricultural influence. This agricultural activity, alongside potential seasonal burning for land clearing, is a key factor impacting air quality. The urban-rural gradient is relatively sharp, with rapid transitions from densely populated areas to open pastureland and forested Cerrado vegetation. The city’s elevation, around 120-150 meters, contributes to localized temperature patterns and potential for temperature inversions, trapping pollutants near the ground. The prevailing winds, influenced by the Amazon basin and the Andes, play a crucial role in pollutant dispersion, or lack thereof.

Pontes e Lacerda experiences a distinct wet and dry season, rather than traditional four seasons. Air quality is generally better during the wet season (roughly November to April) due to increased rainfall which effectively washes particulate matter from the atmosphere. The higher humidity also suppresses dust. However, this period can see localized flooding impacting infrastructure and potentially releasing contaminants. The dry season (May to October) presents the greatest air quality challenges. This is when agricultural burning, a common practice for land preparation, significantly increases particulate matter (PM2.5 and PM10) concentrations. Smoke from these fires can travel long distances, impacting the entire region. Temperature inversions are more frequent during the cooler, drier months, trapping pollutants closer to ground level. August and September are typically the months with the poorest air quality. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during these periods. The prevailing winds during the dry season often carry smoke from the west and southwest, exacerbating conditions. Monitoring wind direction is crucial for predicting air quality fluctuations. Even during the wet season, localized sources like vehicle emissions and construction contribute to pollution, though to a lesser extent.