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El Pueblito, nestled within the state of Querétaro, Mexico, occupies a strategically important position in the Bajío region, a historically fertile and economically vibrant area. Located at approximately 20.54° N, 100.44° W and an elevation of roughly 1900 meters (6234 feet) above sea level, the city benefits from a relatively mild, high-altitude climate. The surrounding landscape is characterized by rolling hills and valleys, part of the Sierra Gorda Biosphere Reserve, a UNESCO World Heritage site. This proximity to a protected natural area offers some buffering against extreme pollution, but also introduces agricultural influences. El Pueblito sits on the edge of an urban–rural gradient, transitioning from the denser urban fabric of Querétaro city to agricultural lands primarily used for maize and wheat cultivation. The Bajío region is a significant industrial hub, with automotive manufacturing and related industries concentrated in nearby cities like San Miguel de Allende and Querétaro city. While El Pueblito itself is not a major industrial center, it experiences indirect impacts from these industrial belts, including transportation-related emissions. The terrain, with its sloping hills, can influence local wind patterns, potentially trapping pollutants in certain areas during periods of low wind. The lack of significant surface water bodies within immediate proximity means that atmospheric deposition is a key pathway for pollutant removal, making air quality highly sensitive to meteorological conditions. The city’s growth, driven by its proximity to larger urban centers, contributes to increasing vehicular traffic and localized pollution sources.

El Pueblito’s air quality exhibits a distinct seasonal pattern dictated by its climate and regional weather systems. The region experiences a pronounced wet and dry season, rather than four distinct seasons. The dry season, typically spanning from November through April, often presents the greatest air quality challenges. Reduced rainfall and lower humidity contribute to the accumulation of particulate matter, particularly PM2.5 and PM10, stemming from agricultural burning practices in surrounding rural areas and increased vehicle emissions due to higher usage. Temperature inversions, common during the cooler months, trap pollutants near the ground, exacerbating the problem. January and February are frequently periods of heightened concern. Conversely, the wet season (May to October) brings relief as rainfall washes away pollutants and increased humidity helps to settle particulate matter. However, periods of intense rainfall can also lead to localized flooding and the release of pollutants from inundated areas. During the monsoon-like periods of July and August, strong winds can disperse pollutants, improving overall air quality. Fog, particularly in the mornings during the dry season, can also trap pollutants, creating localized pockets of poor air quality. 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. Agricultural workers are particularly vulnerable and should utilize appropriate respiratory protection when burning is occurring. Maintaining vehicles and reducing unnecessary travel can contribute to improved air quality for everyone.