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D'Iberville, Mississippi, is situated within Harrison County, on the Gulf Coast, approximately a short distance west of Biloxi. Its geography is defined by a low-lying, flat coastal plain, characteristic of the Mississippi Gulf Coast. The city’s coordinates (30.4709, -88.9011) place it close to the Mississippi Sound, a large estuary of the Gulf of Mexico, significantly influencing local climate and air quality. The terrain is predominantly sandy soil, with minimal elevation changes, making it vulnerable to storm surges and flooding. Surrounding D'Iberville are areas of coastal marshland and pine forests, transitioning into agricultural lands further inland. The urban-rural gradient is relatively sharp, with the city itself being a concentrated area of residential and commercial development amidst a broader rural landscape. Historically, the region has seen industrial activity related to shipbuilding, fishing, and tourism, concentrated along the coast. This proximity to both marine environments and industrial zones creates a complex interplay of pollution sources. Prevailing winds generally blow onshore from the Gulf, potentially transporting pollutants inland, while the flat terrain offers little natural dispersion. The city’s location within a humid subtropical climate further impacts air quality through increased humidity and potential for stagnant air masses.

D'Iberville’s air quality follows a distinct seasonal pattern, largely dictated by meteorological conditions. Summer months (June-August) often see elevated ozone levels due to high temperatures and intense sunlight reacting with vehicle emissions and industrial byproducts. Stagnant air masses, common during these months, exacerbate the issue, trapping pollutants near the ground. Humidity also plays a role, fostering chemical reactions that contribute to ozone formation. Fall (September-November) typically brings improved air quality as temperatures cool and winds become more frequent, dispersing pollutants. However, the risk of wildfires in surrounding areas can occasionally lead to spikes in particulate matter. Winter (December-February) generally experiences the cleanest air, with cooler temperatures and increased precipitation helping to wash pollutants from the atmosphere. However, temperature inversions, where a layer of warm air traps cooler air below, can occasionally occur, leading to localized pollution build-up. Spring (March-May) sees a gradual increase in pollen counts, impacting those with allergies, and a return to more variable weather patterns. Sensitive groups – children, the elderly, and those with respiratory conditions – should be particularly cautious during summer and periods of wildfire activity, limiting strenuous outdoor activity and monitoring local conditions.