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Zacoalco de Torres, nestled within the state of Jalisco, Mexico, occupies a geographically significant position within the broader Lake Chapala bioregion. Located at approximately 20.23° N, 103.58° W and an elevation of around 1,500 meters (4,921 feet) above sea level, the city benefits from a relatively mild, sub-tropical highland climate. The surrounding landscape is characterized by rolling hills and valleys, transitioning from agricultural fields – primarily maize and agave – to patches of remnant mesophilic forest. This agricultural activity, while vital to the local economy, contributes to potential particulate matter emissions, particularly during harvest seasons. Zacoalco de Torres sits on the western edge of the Altos de Jalisco, a region known for its volcanic soils and unique microclimates. Its proximity to Lake Chapala, Mexico’s largest freshwater lake, introduces a moderating influence on temperature and humidity, but also presents a potential sink for pollutants transported by prevailing winds. The urban–rural gradient is relatively sharp; the city itself is a compact settlement, quickly giving way to agricultural land and scattered rural communities. While not directly adjacent to major industrial belts, Zacoalco de Torres is within reasonable commuting distance of Guadalajara, Mexico’s second-largest city, meaning that industrial emissions and vehicular traffic from Guadalajara can occasionally impact local air quality. Topography plays a crucial role; the valley setting can trap pollutants, especially during periods of low wind speed, exacerbating localized air quality challenges. The terrain’s influence on wind patterns is a key factor in understanding Zacoalco’s air quality dynamics.

Zacoalco de Torres experiences a distinct wet and dry season pattern, significantly influencing its air quality profile. The dry season, typically spanning from November to April, often sees a build-up of particulate matter. Reduced rainfall means less natural cleansing of the atmosphere, and agricultural burning, a common practice for land preparation, contributes significantly to PM2.5 and PM10 levels. Temperature inversions are more frequent during these cooler months, trapping pollutants close to the ground, particularly in the mornings. The dry winds from the north can also carry dust and particulate matter from surrounding agricultural areas. Conversely, the wet season (May to October) brings increased rainfall, which naturally washes pollutants from the air, leading to improved air quality. However, periods of intense rainfall can also lead to flooding, which can temporarily release pollutants from soil and water sources. Fog, common during the cooler months, further reduces visibility and can trap pollutants. Outdoor activities are generally more favorable during the wet season, especially during the afternoons when rainfall is more likely. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during agricultural burning periods. While the wet season offers respite, heavy rainfall events can temporarily degrade air quality. Monitoring local weather patterns and agricultural practices is crucial for anticipating and mitigating air quality risks throughout the year. The interplay of wind patterns, temperature fluctuations, and precipitation dictates the seasonal air quality narrative in Zacoalco de Torres.