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Greenville, Mississippi, situated in the heart of the Delta, presents a unique geographic context influencing its air quality. Located at 33.3850°N, 91.0514°W, the city rests on relatively flat terrain, characteristic of the Mississippi Alluvial Plain. The elevation is low, averaging around 164 feet above sea level, contributing to limited atmospheric dispersion of pollutants. Greenville’s position along the Mississippi River is significant; while the river provides a transportation corridor, it also facilitates the movement of industrial activity and associated emissions upstream and downstream. The surrounding landscape is dominated by extensive agricultural lands, primarily cotton, soybeans, and rice, which contribute to particulate matter from field preparation, harvesting, and pesticide/fertilizer application. The urban-rural gradient is relatively sharp, with agricultural fields immediately bordering the city limits. This proximity means Greenville is directly impacted by agricultural practices. Historically, the Delta region has been a hub for industrial processing of agricultural products, and remnants of this activity, alongside modern transport infrastructure, contribute to localised pollution sources. The flat topography and limited prevailing winds can exacerbate pollutant concentrations, particularly during stable atmospheric conditions. The city’s location within a humid subtropical climate further influences pollutant behaviour, promoting secondary pollutant formation.

Greenville’s air quality follows a distinct seasonal pattern dictated by meteorological conditions and human activity. Spring (March-May) often sees elevated particulate matter due to agricultural field preparation and pollen release, impacting those with respiratory sensitivities. Summer (June-August) brings high temperatures and humidity, fostering the formation of ground-level ozone, particularly on stagnant, sunny days. Avoiding prolonged outdoor exertion during peak sunlight hours is advisable. Autumn (September-November) typically offers the best air quality, with cooler temperatures and increased wind speeds aiding pollutant dispersion. However, agricultural burning after harvest can cause temporary spikes in particulate matter. Winter (December-February) experiences frequent temperature inversions, trapping pollutants near the ground, and wood burning for heating can contribute to localised smoke. Sensitive groups, including children, the elderly, and those with pre-existing respiratory or cardiovascular conditions, should limit outdoor activity during inversion events. Fog, common in winter, can also exacerbate particulate matter concentrations. Monitoring local conditions and heeding health advisories is crucial. The Delta’s generally low wind speeds throughout the year mean pollutants tend to linger, requiring consistent attention to air quality trends.