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Montero, Bolivia, nestled within the Santa Cruz Department, occupies a geographically significant position in the eastern lowlands of the country. Located at approximately -17.3422° latitude and -63.2558° longitude, the city sits at a relatively low elevation of around 350 meters (1,150 feet) above sea level, placing it squarely within the Beni savanna ecoregion. This terrain is characterized by a gently undulating landscape of grasslands and wetlands, transitioning into the Amazon rainforest to the north and agricultural lands to the south. The city’s proximity to the Paraguay River, though not directly on its banks, influences local humidity and weather patterns. Montero’s regional position is crucial; it serves as a vital agricultural hub, surrounded by extensive soybean, maize, and livestock farming areas. This agricultural intensity contributes to both economic prosperity and potential air quality challenges. The urban–rural gradient around Montero is gradual, with smaller agricultural communities and scattered settlements blending into the expansive savanna. The surrounding landscape is predominantly open, allowing for relatively good air dispersion under favorable meteorological conditions. However, the prevalence of agricultural burning during land clearing and harvest seasons, combined with the increasing vehicular traffic within the city and the potential for industrial activity in nearby zones, can significantly impact local air quality. The flat topography can exacerbate pollution episodes, particularly when coupled with temperature inversions, trapping pollutants close to the ground. The Beni's climate, hot and humid year-round, also influences pollutant behavior.

Montero’s air quality experiences a distinct seasonal pattern dictated by its tropical climate, characterized by a wet and dry season rather than the traditional four seasons. The dry season, typically spanning from April to October, presents the most significant air quality concerns. During these months, reduced rainfall and lower humidity contribute to a build-up of particulate matter, largely stemming from agricultural burning practices. Farmers often conduct controlled burns to clear land for planting or harvest, releasing substantial amounts of smoke and pollutants into the atmosphere. Temperature inversions, common during the cooler nights of the dry season, trap this pollution near the ground, leading to periods of reduced visibility and potential respiratory irritation. The wind patterns during this period are often light and variable, further hindering pollutant dispersal. Conversely, the wet season (November to March) brings increased rainfall and higher humidity, naturally cleansing the air and significantly improving air quality. Frequent rainfall washes away particulate matter, and higher humidity can help to settle dust. Fog, while less frequent than rainfall, can also temporarily trap pollutants, but the overall effect of the wet season is a marked improvement. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak burning periods and seeking shelter indoors when air quality is visibly affected. The months of July and August often experience the most persistent periods of elevated pollution due to a combination of agricultural activity and stable atmospheric conditions.