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Cujubim, nestled in the southwestern Brazilian state of Rondônia, occupies a strategically important position within the Amazon biome. Located at -9.3628° latitude and -62.5853° longitude, the city’s geography is dominated by the expansive Amazon rainforest, a landscape characterized by low-lying terrain and dense vegetation. The elevation is relatively modest, averaging around 150 meters above sea level, contributing to a humid, tropical climate. The Purus River, a major tributary of the Amazon, flows nearby, influencing local humidity and microclimates. Cujubim’s urban character is that of a small, developing municipality, largely shaped by its role as a regional hub for agricultural activities, particularly cattle ranching and soybean cultivation. These agricultural zones extend outwards, creating a gradual urban–rural gradient. While Cujubim itself lacks significant heavy industry, the broader Rondônia region experiences deforestation and agricultural burning, which can impact air quality. The surrounding landscape is overwhelmingly rural, with vast tracts of pastureland interspersed with patches of remaining rainforest. The city’s location within the Amazon basin means it is susceptible to the regional effects of deforestation, including altered rainfall patterns and increased particulate matter from biomass burning. The relatively flat terrain can also exacerbate the accumulation of pollutants, particularly during periods of stagnant air. The proximity to agricultural lands means that pesticide drift and fertilizer application can also contribute to localized air quality concerns.

Cujubim’s air quality follows a distinct wet and dry seasonal pattern, dictated by the Amazon’s climate. The wet season, typically from November to April, brings consistent rainfall and high humidity, generally leading to improved air quality as precipitation washes away particulate matter. However, persistent cloud cover can reduce solar radiation, potentially increasing ozone levels in certain conditions. The dry season, from May to October, presents a more complex picture. As rainfall decreases, the risk of agricultural burning significantly increases. Farmers often employ slash-and-burn techniques to clear land for pasture or cultivation, releasing substantial amounts of smoke and particulate matter into the atmosphere. This is often the period of greatest air quality concern. Meteorological conditions during the dry season frequently involve temperature inversions, where a layer of warm air traps cooler air near the ground, preventing pollutants from dispersing. Stagnant air masses are also common, further exacerbating the problem. August and September are typically the months with the highest risk of elevated pollution levels due to peak burning activity. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during these periods. During the wet season, while overall air quality is generally better, individuals with allergies may experience increased symptoms due to high pollen and mold spore counts. Maintaining indoor air quality through ventilation and air purification can be beneficial throughout the year.