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Totoró, nestled within the department of Cauca, Colombia, occupies a geographically significant position in the Andean foothills. Located at approximately 2.5117° latitude and -76.4003° longitude, the town’s elevation of around 1,850 meters (6,070 feet) above sea level immediately influences its climate and, consequently, its air quality. The surrounding landscape is dominated by steep slopes, verdant valleys, and remnants of cloud forest, characteristic of the Colombian Pacific watershed. Totoró sits within a transitional zone, experiencing influences from both the Andean highlands and the humid Pacific lowlands. This creates a microclimate prone to temperature inversions, particularly during drier periods. The town’s proximity to the Cauca River, though not directly adjacent, provides a degree of moisture and influences local wind patterns. Agriculture is a dominant land use in the surrounding rural areas, with coffee cultivation and livestock farming being prevalent. This agricultural activity, while vital to the local economy, can contribute to particulate matter pollution, especially during harvesting and burning seasons. The urban–rural gradient around Totoró is relatively sharp; the town itself is small, with a population of just over 17,000, transitioning quickly to agricultural lands and forested slopes. The terrain’s rugged nature limits extensive industrial development, but occasional small-scale processing facilities related to agriculture may exist, potentially impacting localized air quality. The valley setting also tends to trap pollutants, especially when wind speeds are low.

Totoró’s tropical climate exhibits a distinct wet and dry season pattern, significantly impacting air quality throughout the year. The dry season, typically spanning from December to March, often brings the most concerning air quality conditions. Reduced rainfall leads to lower atmospheric moisture, increasing the propensity for temperature inversions to form during the cooler nights. These inversions trap pollutants near the ground, exacerbating any existing emissions. Agricultural burning, a common practice for land clearing and crop residue disposal, intensifies during this period, releasing substantial amounts of particulate matter and contributing to hazy conditions. The wet season, from April to November, generally sees improved air quality due to frequent rainfall that washes pollutants from the atmosphere. However, periods of intense rainfall can also lead to increased humidity and fog, which, while cleansing, can temporarily reduce visibility. Wind patterns are generally variable, but during the dry season, weaker winds contribute to pollutant stagnation. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during agricultural burning periods (typically January-February). Outdoor activities are generally more favorable during the wet season, although periods of heavy fog may still limit visibility. The interplay of elevation, humidity, and agricultural practices creates a dynamic air quality profile, demanding vigilance and proactive mitigation strategies throughout the year. The cooler temperatures during the dry season can also increase the formation of photochemical smog if volatile organic compounds are present.