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Ocean City, New Jersey, is a barrier island city nestled along the Atlantic coastline at coordinates 39.2681° N, 74.6020° W. Its geography is fundamentally shaped by its position on the coastal plain, a relatively flat terrain only slightly elevated above sea level. This low elevation makes the city particularly vulnerable to coastal flooding and storm surges, but also influences air quality. The surrounding landscape is dominated by the Atlantic Ocean to the east, and the mainland of Cape May County to the west, characterized by a mix of low-lying wetlands, agricultural lands, and increasingly, suburban development. The city’s urban character is distinctly seasonal, swelling with tourists during the summer months. While Ocean City itself lacks heavy industry, its proximity to larger industrial and transportation corridors along the New Jersey Turnpike and in Philadelphia contributes to regional background pollution levels. The urban-rural gradient is sharp; moving inland quickly transitions from dense summer tourism to more sparsely populated agricultural areas. Prevailing winds generally blow from the southwest, potentially carrying pollutants from inland sources towards the coast, though the ocean breeze often provides some dilution. Salt spray from the ocean can also influence atmospheric chemistry, affecting particulate matter composition.

Ocean City’s air quality follows a distinct seasonal pattern. Spring sees a gradual improvement after winter, but pollen counts can be high, impacting those with allergies. Winds become more variable, sometimes bringing in pollutants from inland agricultural burning or industrial areas. Summer, despite the cooling ocean breezes, often experiences elevated ozone levels due to strong sunlight and warm temperatures reacting with vehicle emissions and volatile organic compounds. July and August are typically the months when conditions are least favourable for those with respiratory sensitivities. Autumn brings clearer skies and cooler temperatures, generally offering the best air quality of the year. The prevailing winds shift, often flushing out stagnant air. However, occasional nor'easters can bring in marine aerosols and potentially stir up dust. Winter is characterized by cold, dry air and infrequent precipitation. While overall pollutant concentrations are lower due to reduced temperatures and less sunlight, wood burning for heating can contribute to localized particulate matter increases. Sensitive groups, including children, the elderly, and those with pre-existing respiratory conditions, should be particularly mindful during summer ozone events and winter wood smoke episodes.