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San José Tenango, nestled within the state of Oaxaca, Mexico, occupies a geographically complex position at coordinates 18.1500, -96.7333. The city is situated within the Sierra Norte mountains, a region characterized by steep slopes and deeply incised valleys. Its elevation, approximately 1,600 meters (5,250 feet) above sea level, significantly influences local climate and air quality. The surrounding landscape is predominantly rural, dominated by cloud forests and agricultural lands, primarily small-scale coffee and maize cultivation. While no major industrial belts directly impact San José Tenango, regional agricultural practices, including slash-and-burn techniques employed in some areas, contribute to particulate matter emissions, particularly during the dry season. The urban-rural gradient is sharp; the city itself is relatively small with a population of 18,316, quickly transitioning to forested hillsides. Proximity to larger population centers like Oaxaca City (approximately 80km distant) means long-range transport of pollutants is possible, though less impactful than local sources. The valley topography can trap air masses, exacerbating pollution episodes, especially during temperature inversions. The lack of significant bodies of water nearby limits evaporative cooling and can contribute to drier conditions, increasing dust suspension.

San José Tenango experiences a distinct wet and dry season, heavily influencing air quality. The dry season, typically from November to April, sees a marked increase in particulate matter due to agricultural burning for land preparation and increased dust from unpaved roads. Lower humidity and stable atmospheric conditions during these months promote pollutant concentration. February and March are often the worst months for respiratory health. The wet season, spanning May to October, generally brings improved air quality as rainfall effectively washes away pollutants and suppresses dust. However, increased cloud cover can lead to temperature inversions, trapping pollutants at lower altitudes, particularly in the valley bottom. September and October, coinciding with the tail end of the rainy season and harvest activities, can still experience elevated particulate matter. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during the dry season and monitor their health closely. During the wet season, while overall air quality is better, be mindful of potential mold growth indoors due to increased humidity. Wind patterns, driven by regional topography, play a crucial role in dispersing or concentrating pollutants.