Catarina Air Quality Index (AQI)

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Catarina, San Marcos, Guatemala, nestled within the western highlands, occupies a geographically significant position influencing its air quality. Located at approximately 14.85° latitude and -92.08° longitude, and with an elevation of around 1,950 meters (6,400 feet) above sea level, the city experiences a cool, temperate climate typical of this region. The surrounding landscape is dominated by steep, forested slopes and valleys, characteristic of the Sierra Madre de Gualán-Zacapán mountain range. This terrain significantly impacts air circulation; the valley location can trap pollutants, particularly during periods of low wind. Catarina’s proximity to Lake Ipira, a relatively small but important water body, can influence local humidity and fog formation, which can exacerbate air stagnation. The urban-rural gradient transitions rapidly, with agricultural lands – primarily coffee and maize cultivation – dominating the immediate periphery. While Catarina itself is a relatively small urban center with a population of 35,542, it sits within a broader regional network of towns and villages. The absence of major industrial belts directly adjacent to Catarina is a mitigating factor, however, agricultural burning practices during land clearing and harvest seasons, common across the San Marcos department, contribute significantly to particulate matter pollution. The mountainous terrain also limits the dispersion of pollutants, creating localized air quality challenges.

Catarina’s air quality follows a distinct wet and dry seasonal pattern, dictated by Guatemala’s tropical monsoon climate. The dry season, typically spanning November through April, often sees a noticeable increase in air pollution. Reduced rainfall means less natural cleansing of the atmosphere, and the prevailing winds, frequently light and variable, struggle to disperse pollutants. Temperature inversions, common during these cooler, drier months, trap emissions close to the ground, intensifying localized pollution. Agricultural burning, a widespread practice for land preparation, peaks during this period, releasing significant amounts of smoke and particulate matter. The wet season, from May to October, brings frequent rainfall, which naturally washes pollutants from the air, leading to improved air quality. However, periods of heavy fog, particularly in the mornings, can temporarily reduce visibility and trap moisture-borne pollutants. October, marking the transition between seasons, can be particularly challenging as agricultural burning continues alongside decreasing rainfall. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak pollution episodes, often in the mornings. During the wet season, while generally better, periods of fog necessitate similar precautions. The interplay of topography, agricultural practices, and seasonal meteorology creates a dynamic air quality profile for Catarina.