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Mexquitic de Carmona, nestled in the state of San Luis Potosí, Mexico, occupies a unique geographic position within the central Mexican Plateau. Located at coordinates 22.2667° N, -101.1167° W, the city sits at an elevation of approximately 1,850 meters (6,070 feet), contributing to a generally cooler climate than lower-lying regions. The surrounding landscape is characterized by rolling hills and semi-arid scrubland, typical of the Comarca Lagunera region. While not directly adjacent to a major body of water, the city is influenced by regional hydrological patterns and occasional arroyos. The urban-rural gradient is quite pronounced; Mexquitic de Carmona serves as a regional hub for surrounding agricultural communities, primarily focused on livestock raising and dryland farming. This agricultural activity, alongside smaller-scale industrial operations within and around the city, contributes to localized pollution sources. The terrain, while not mountainous, can create localized pockets where air stagnates, exacerbating pollution events. The city’s position within a broad valley influences wind patterns, sometimes leading to the accumulation of pollutants during periods of calm weather. Understanding these geographical factors is crucial for assessing and mitigating air quality challenges in Mexquitic de Carmona.

Air quality in Mexquitic de Carmona experiences distinct seasonal variations. The dry season, spanning roughly November to May, typically sees poorer air quality. Reduced rainfall means less atmospheric cleansing, and increased dust from agricultural activities and unpaved roads becomes prevalent. Temperature inversions are common during the cooler winter months (December-February), trapping pollutants near the ground. March and April often experience increased burning of agricultural waste, further degrading air quality. The wet season, from June to October, generally brings improvement. Rainfall washes away particulate matter, and increased humidity can suppress dust. However, localized flooding can disrupt transportation and potentially release pollutants from compromised infrastructure. August and September, coinciding with peak rainfall, are usually the most favourable months for outdoor activity. Sensitive groups – children, the elderly, and those with respiratory conditions – should be particularly cautious during the dry season, limiting strenuous outdoor exertion and monitoring their health. Periods of strong winds, common in spring, can also stir up dust and temporarily worsen conditions. Overall, planning outdoor activities around the rainy season is advisable.