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North Myrtle Beach, South Carolina, is a coastal city deeply interwoven with the Atlantic Ocean’s influence. Situated at coordinates 33.8232, -78.7082, its geography is characterised by a low-lying, sandy terrain typical of the Grand Strand region. The city’s elevation remains consistently near sea level, making it particularly vulnerable to coastal weather systems and saltwater intrusion. Unlike inland South Carolina, North Myrtle Beach lacks significant industrial belts; its economy is primarily driven by tourism and related services. However, surrounding Horry County does contain some agricultural activity, primarily silviculture and limited farming, which can contribute to seasonal particulate matter. The urban-rural gradient is relatively sharp, transitioning quickly from developed beachfront areas to maritime forests and wetlands inland. The proximity to the ocean is a dominant factor in air quality, providing a constant source of sea salt aerosols, but also facilitating the dispersion of pollutants via prevailing sea breezes. The city’s location within a subtropical climate zone means high humidity and frequent rainfall, influencing pollutant washout. The extensive network of canals and inlets further complicates air flow patterns, creating localized variations in air quality. The long coastline exposes the city to potential impacts from offshore sources, including shipping emissions.

North Myrtle Beach experiences a distinct seasonal air quality pattern dictated by meteorological conditions and human activity. Spring (March-May) sees increasing temperatures and pollen counts, impacting those with allergies, though generally good air quality due to frequent rainfall washing away pollutants. Summer (June-August) brings high humidity and occasional stagnant air masses, potentially trapping ozone and particulate matter from vehicle emissions and recreational activities. While sea breezes offer some relief, prolonged heat waves can exacerbate pollution. Autumn (September-November) is typically the most pleasant period for air quality, with cooler temperatures, lower humidity, and consistent winds dispersing pollutants. However, agricultural burning in surrounding areas can occasionally lead to spikes in particulate matter. Winter (December-February) is generally characterised by the cleanest air, with cooler temperatures reducing ozone formation and stronger winds promoting dispersion. However, temperature inversions, where a layer of warm air traps cooler air near the surface, can occur, leading to localized pollutant build-up. Sensitive groups – children, the elderly, and those with respiratory conditions – should be particularly cautious during summer heat waves and periods of stagnant air, limiting strenuous outdoor activity. Monitoring local conditions is crucial, as weather patterns can shift rapidly.