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Salisbury, Maryland, situated on the Delmarva Peninsula, presents a unique geographic context influencing its air quality. The city lies approximately 80 miles east of Washington D.C., and 30 miles south of Dover, Delaware, acting as a regional hub for the Eastern Shore. Its coordinates (38.3756, -75.5865) place it within a relatively flat coastal plain, with elevations generally below 100 feet. This low-lying terrain contributes to limited natural air dispersion. The Wicomico River flows through Salisbury, providing a local water source but also potentially trapping pollutants during temperature inversions. Surrounding Salisbury are extensive agricultural lands, particularly poultry farming, a significant economic driver but also a source of ammonia emissions, a precursor to particulate matter. To the west, the landscape transitions towards more urban and suburban development as it approaches the I-95 corridor. The urban-rural gradient is relatively sharp, with agricultural areas immediately bordering the city limits. Proximity to major transportation routes, including US Route 13 and US Route 50, introduces vehicle emissions. The coastal location means potential impacts from sea breezes and occasional nor'easter storms, which can both disperse and concentrate pollutants depending on meteorological conditions. Understanding these factors is crucial for assessing and mitigating Salisbury’s air quality challenges.

Salisbury’s air quality follows a distinct seasonal pattern. Spring (March-May) often sees moderate pollution levels as agricultural activity increases, releasing ammonia from poultry operations and fertilizers. Winds are variable, sometimes leading to stagnant air. Summer (June-August) typically experiences the best air quality, aided by stronger prevailing winds and higher temperatures promoting pollutant dispersion, though ozone formation can be a concern on hot, sunny days. August can be particularly humid, potentially trapping pollutants. Autumn (September-November) brings a return to moderate pollution as agricultural practices continue and temperature inversions become more frequent, especially in October and November. These inversions trap cooler air near the surface, concentrating pollutants. Winter (December-February) often presents the poorest air quality. Reduced sunlight limits pollutant breakdown, and wood burning for heating increases particulate matter. Calm, cold conditions exacerbate temperature inversions, leading to prolonged periods of stagnant air. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during these winter months. Monitoring wind patterns and avoiding peak heating hours can help minimize exposure. Overall, spring and autumn require increased awareness, while summer generally offers the most favourable conditions.