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Moloacán, nestled within the state of Veracruz, Mexico, occupies a geographically significant position on the Gulf Coastal Plain. Located at approximately 17.98° North, 94.35° West, the city’s terrain is predominantly flat, characteristic of the low-lying coastal region. Its elevation averages around 10 meters above sea level, placing it within a zone highly susceptible to humidity and coastal influences. The surrounding landscape is a mosaic of agricultural lands – primarily sugarcane and citrus plantations – interspersed with pockets of tropical forest and mangrove ecosystems along the coastline. This agricultural activity, while vital to the regional economy, contributes to localized air quality challenges. Moloacán’s proximity to the Gulf of Mexico significantly impacts its climate and, consequently, its air quality. The prevailing easterly winds, common along the coast, can transport pollutants from industrial areas further inland, while also influencing the dispersion of emissions generated within the city itself. The urban–rural gradient around Moloacán is relatively gradual, with smaller agricultural communities blending into the urban fabric. While not directly adjacent to major industrial belts, the city’s location within Veracruz, a state with significant oil and gas infrastructure, means it can experience occasional impacts from regional industrial emissions. The flat topography limits vertical mixing of air, potentially trapping pollutants closer to ground level, especially during periods of stable atmospheric conditions. The surrounding wetlands and coastal forests, however, do offer some natural filtration capacity, mitigating some of the impacts.

Moloacán’s tropical climate dictates a distinct wet and dry season pattern, profoundly influencing its air quality dynamics. The dry season, typically spanning from March to May, often sees a slight increase in particulate matter concentrations. This is partly due to reduced rainfall, which limits the natural cleansing effect of precipitation, and increased agricultural burning practices as farmers prepare fields for planting. The lack of consistent rainfall also allows dust and soil particles to become more readily airborne. Conversely, the wet season, from June to October, brings frequent rainfall and higher humidity, generally leading to improved air quality as pollutants are washed from the atmosphere. However, periods of intense rainfall can sometimes trigger localized flooding, which can temporarily release pollutants from inundated areas. Throughout the year, temperature inversions, particularly during the cooler months (December-February), can trap pollutants near the ground, exacerbating air quality issues. These inversions occur when a layer of warm air sits above a layer of cooler air, preventing vertical mixing. Fog, common during the cooler, drier months, also contributes to pollutant accumulation. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during periods of agricultural burning (March-May) and when temperature inversions are present. Limiting outdoor exertion during these times and monitoring local air quality reports are advisable. The transition months (May and October) often present unpredictable air quality conditions, requiring vigilance and adaptive strategies.