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Yecuatla, nestled within the state of Veracruz, Mexico, occupies a geographically complex position within the southern portion of the Gulf Coastal Plain. Located at coordinates 19.8667, -96.7833, the city’s terrain is characterized by low-lying hills and plains, typical of the region’s transition zone between the Sierra Madre del Golfo mountains and the coastal wetlands. The elevation, relatively modest, contributes to limited atmospheric dispersion. Yecuatla is situated approximately 60 kilometers inland from the Gulf of Mexico, meaning it doesn’t benefit from strong coastal breezes for consistent pollutant flushing. The surrounding landscape is predominantly agricultural, with significant cultivation of sugarcane, coffee, and citrus fruits. This agricultural activity, while economically vital, introduces potential sources of particulate matter from field preparation, harvesting, and the use of agricultural chemicals. The urban-rural gradient is relatively sharp; Yecuatla itself is a smaller city of around 12,108 inhabitants, surrounded by more sparsely populated rural communities. Limited industrial development within Yecuatla itself means that regional transport, particularly road traffic connecting to larger urban centers like Veracruz city, is a more significant contributor to localised air pollution. The lack of substantial natural barriers to air flow from the west and south-west means pollutants can accumulate during stable atmospheric conditions.

Yecuatla experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, typically from February to May, sees a peak in particulate matter pollution. Reduced rainfall means less atmospheric scavenging, allowing dust and combustion byproducts to linger. Lower humidity also contributes to increased resuspension of road dust. Temperature inversions are common during the cooler mornings of these months, trapping pollutants near ground level. The wet season, spanning June to November, generally brings improved air quality due to frequent rainfall washing away pollutants and increased atmospheric mixing. However, intense rainfall events can also lead to localised flooding and the spread of agricultural runoff, potentially introducing contaminants. December and January represent a transitional period, with variable rainfall and moderate pollution levels. Sensitive groups – children, the elderly, and those with respiratory conditions – should be particularly cautious during the dry season, limiting strenuous outdoor activity. The months of June through September generally offer the most favourable conditions for outdoor pursuits. Localized burning of agricultural waste after harvest in April and May can cause short-term spikes in pollution, requiring extra vigilance.