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San Felipe Jalapa de Díaz, nestled within the Sierra Madre del Sur mountain range in Oaxaca, Mexico, occupies a geographically significant position influencing its air quality. Located at approximately 18.0667° N, -96.5333° W and an elevation of around 1,350 meters (4,430 feet) above sea level, the city experiences a distinct highland climate. The surrounding landscape is characterized by steep slopes, dense cloud forests, and agricultural terraces, primarily dedicated to coffee and maize cultivation. This rural agricultural zone directly borders the urban area, creating an urban–rural gradient where agricultural practices can impact local air quality. The Sierra Madre del Sur acts as a barrier, influencing wind patterns and often trapping pollutants within the valley. While San Felipe Jalapa de Díaz lacks immediate proximity to large bodies of water, the region receives substantial rainfall during the wet season, which can temporarily cleanse the air. The city’s relatively small size and limited industrial activity mean that local sources, such as vehicle emissions, residential wood burning for cooking and heating, and agricultural burning (particularly during land clearing), are the primary contributors to air pollution. The terrain’s topography, combined with the prevailing wind patterns, can lead to localized concentrations of pollutants, especially during periods of calm weather. The valley setting inherently limits dispersion, making the city vulnerable to air quality degradation.

San Felipe Jalapa de Díaz’s air quality follows a distinct seasonal pattern dictated by Oaxaca’s wet and dry seasons. The dry season, typically spanning from November to April, often sees a gradual increase in particulate matter. This is largely attributable to agricultural burning practices as farmers prepare fields for the next planting cycle. Reduced rainfall during this period also limits natural cleansing of the atmosphere. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near the ground, exacerbating the issue. The months of January and February are frequently periods of heightened concern. Conversely, the wet season (May to October) brings relief as frequent rainfall washes away accumulated pollutants. Increased cloud cover also reduces solar radiation, which can contribute to the formation of ground-level ozone. However, periods of heavy fog, particularly during the transition months (May and October), can temporarily reduce visibility and trap moisture-laden pollutants. During the wet season, outdoor activities are generally more favorable, though those with respiratory sensitivities should still be mindful of potential mold and mildew growth associated with increased humidity. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should limit prolonged exposure to outdoor air during the dry season, especially on days with visible smoke or haze. The intensity of agricultural burning significantly influences the overall air quality, making awareness of local agricultural schedules crucial for minimizing exposure.