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Florence, South Carolina, is situated within the Atlantic Coastal Plain, a gently sloping landscape transitioning from the Piedmont region to the west. The city’s coordinates (34.1780, -79.7898) place it roughly equidistant between the state’s major metropolitan areas of Columbia and Myrtle Beach. The terrain is largely flat, characterized by fertile farmland and pine forests, influencing local wind patterns and pollutant dispersion. The Pee Dee River flows nearby, providing a crucial water resource but also potentially contributing to humidity and localized fog formation, which can trap pollutants. Florence serves as a regional hub for agriculture, particularly tobacco and soybeans, and experiences some industrial activity related to manufacturing and distribution, concentrated along major transportation corridors like I-95 and I-20. This transportation network, while vital for the economy, is a significant source of vehicle emissions. The urban-rural gradient is relatively sharp; moving just a few miles outside the city limits quickly leads to predominantly agricultural land. This proximity means pollutants generated within Florence can be diluted by rural air masses, but also that agricultural practices, including fertilizer application and seasonal burning, can contribute to particulate matter levels. The low elevation and coastal plain location mean Florence is susceptible to humidity and stagnant air conditions.

Florence’s air quality follows a distinct seasonal pattern. Spring (March-May) often sees elevated pollen counts, exacerbating respiratory issues, alongside moderate levels of ground-level ozone formation as temperatures rise and sunlight increases. Summer (June-August) brings the highest ozone concentrations, driven by heat and intense sunlight reacting with vehicle emissions and industrial byproducts. Stagnant air masses are common, trapping pollutants. Autumn (September-November) typically offers the cleanest air, with cooler temperatures and increased wind speeds dispersing pollutants. However, agricultural burning of crop residue can lead to temporary spikes in particulate matter. Winter (December-February) experiences generally good air quality, but wood burning for heating, particularly in more rural areas surrounding Florence, can contribute to localized particulate matter pollution. Temperature inversions, where a layer of warm air traps cooler air near the surface, are more frequent during winter months, worsening pollution events. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during peak ozone periods in summer and be mindful of particulate matter levels during agricultural burning in autumn. Monitoring forecasts and adjusting activity levels accordingly is crucial for protecting health.