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Santa Teresa del Tuy is situated in the Tuy Valley of Miranda State, Venezuela, approximately 40 kilometers southwest of Caracas, positioning it within the broader Caracas metropolitan region's urban sprawl. The city lies at an elevation of around 200 meters above sea level in a valley flanked by the Coastal Range to the north and the Interior Range to the south, creating a topographical basin that can trap pollutants. Its coordinates at 10.2333°N, -66.6639°W place it near the Tuy River, which flows through the valley, though this proximity does little to mitigate air quality issues due to the river's modest size and seasonal variability. The urban character is marked by rapid, often unplanned growth, transitioning from rural to densely populated areas, with a population of over 260,000 contributing to traffic congestion and residential emissions. Surrounding landscapes include agricultural zones to the south and east, where farming activities can add particulate matter, while the valley's confinement limits dispersion of pollutants from general urban sources like vehicles, industry, and waste burning. The urban-rural gradient shows increasing pollution toward the city center, exacerbated by the valley's topography that fosters temperature inversions, particularly in drier months, trapping smog and reducing air quality. This geographic setting, combined with its role as a commuter hub for Caracas, makes Santa Teresa del Tuy vulnerable to persistent air pollution challenges, with limited natural ventilation due to the enclosing mountains.

In Santa Teresa del Tuy, air quality fluctuates seasonally due to Venezuela's tropical climate, though specific peak months vary. During the dry season from December to April, reduced rainfall and clearer skies lead to higher pollution levels, as particulate matter from urban activities accumulates without washout; January and February often see the worst conditions due to temperature inversions in the valley, trapping pollutants near the ground and creating hazy days. Sensitive groups, such as those with respiratory issues, should limit outdoor exertion in these months, especially during morning hours when inversions are strongest. The wet season from May to November brings relief, with frequent rains from May to October scrubbing the air of pollutants, resulting in cleaner conditions; however, humidity can occasionally combine with emissions to form smog, particularly in transitional months like May and November. Wind patterns, influenced by the valley's orientation, are generally weak, offering little dispersal, but occasional breezes from the Caribbean to the north provide temporary improvements. Fog is rare, but when it occurs in cooler months, it can exacerbate visibility issues and pollutant retention. For outdoor activities, the best times are during the wet season, particularly June to September, when rains are heaviest and air is freshest, while the dry season's peak months should be avoided for strenuous exercise. Health guidance includes monitoring local air quality reports, using masks during high-pollution periods, and planning activities for late afternoons when inversions may lift slightly.