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Zapopan, situated in the western Mexican state of Jalisco, forms the northwestern quadrant of the Guadalajara Metropolitan Area, one of Mexico's largest urban agglomerations. Nestled within the Valley of Atemajac at approximately 1,600 meters above sea level, the city's geography significantly influences its air quality dynamics. The valley is encircled by the Primavera Forest to the west and the Sierra Madre Occidental foothills to the north and east, creating a natural bowl that traps pollutants under stable atmospheric conditions. Zapopan's urban character blends affluent residential neighborhoods with commercial hubs and industrial corridors, particularly along the Periférico beltway, where manufacturing and automotive activities contribute to emissions. Proximity to agricultural zones in the surrounding Jalisco countryside introduces particulate matter from burning practices, while the lack of major water bodies nearby limits natural cleansing through sea breezes. The city's position on a high plateau results in intense solar radiation that accelerates photochemical smog formation from vehicle exhaust and industrial emissions. As Zapopan expands along an urban–rural gradient toward the Primavera Forest, deforestation and land-use changes further exacerbate dust and pollutant dispersion. The topographic confinement of the valley, combined with dense urbanization, creates a persistent challenge for air quality management, making geographic factors central to understanding pollution patterns in this rapidly growing municipality.

Zapopan's air quality follows a distinct seasonal rhythm shaped by its highland tropical climate, with dry and wet seasons dictating pollution fluctuations. During the dry season from November to May, particularly in late winter and early spring (February to April), pollution peaks due to thermal inversions that trap pollutants in the Valley of Atemajac. Cool nights and warm days create stable atmospheric layers, preventing vertical mixing and allowing particulate matter and ozone to accumulate from vehicle traffic, industrial emissions, and agricultural burning. This period poses the highest risk for sensitive groups like children, the elderly, and those with respiratory conditions, who should limit outdoor exertion, especially during midday when ozone levels spike. The rainy season from June to October brings relief as afternoon thunderstorms and increased humidity wash pollutants from the air, with August and September typically offering the cleanest conditions for outdoor activities. However, occasional tropical storms can stir up dust and debris. Winter months (December-January) see moderate pollution exacerbated by holiday fireworks and increased heating emissions, while persistent northeast trade winds during this time provide some dispersion. Residents should monitor local air quality advisories year-round, with the dry season requiring heightened precautions such as using air purifiers indoors and scheduling outdoor exercise for early mornings when pollution is lower.