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Coatzacoalcos occupies a strategic position in southeastern Veracruz, Mexico, where the Coatzacoalcos River meets the Gulf of Mexico, creating a sprawling urban-industrial complex on low-lying coastal plains. Situated at just 10 meters above sea level, the city's flat terrain and proximity to the Gulf profoundly influence its air quality dynamics. As the heart of Mexico's petroleum industry, Coatzacoalcos forms part of the 'Corredor Industrial Coatzacoalcos-Minatitlán,' a dense industrial belt dominated by petrochemical plants, refineries, and shipping terminals that line the riverbanks and coastline. The urban area transitions abruptly from industrial zones to residential neighborhoods, with limited green buffers, creating sharp pollution gradients. To the south, the city borders tropical wetlands and agricultural lands, while the Gulf of Mexico to the north provides some maritime ventilation. However, the surrounding lowland topography—encircled by the Sierra de los Tuxtlas volcanic range to the west and the Chimalapas highlands to the south—can trap pollutants under certain meteorological conditions. The city's location at a major river mouth exacerbates humidity and particulate matter accumulation, while industrial emissions from the petroleum corridor mix with urban vehicle exhaust, creating complex pollution cocktails that hover over the basin-like landscape.

Coatzacoalcos experiences a tropical savanna climate with distinct wet and dry seasons that shape its air quality patterns throughout the year. During the dry season from November to April, reduced rainfall and frequent temperature inversions trap industrial and vehicular emissions close to the ground, particularly in December and January when cooler nights create stable atmospheric layers. These months see the highest pollution concentrations, with mornings often shrouded in industrial haze mixed with river fog—sensitive groups like asthmatics and elderly residents should limit outdoor exertion during early hours. The rainy season from May to October brings relief through daily thunderstorms and strong sea breezes from the Gulf that disperse pollutants effectively; June through August offer the cleanest air for outdoor activities despite high humidity. However, tropical storms and hurricanes from August to October can temporarily worsen air quality by stirring up dust and industrial residues before cleansing rains arrive. Wind patterns shift seasonally: northerly winds in winter carry some industrial plumes toward the city center, while summer southeasterlies push pollution offshore. Year-round, the combination of high humidity and industrial emissions creates persistent ground-level ozone challenges, peaking on hot, stagnant afternoons regardless of season.