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Lewisburg, Tennessee, nestled in Marshall County, occupies a gently rolling landscape characteristic of the Eastern Highland Rim physiographic province. Situated approximately 65 miles southeast of Nashville, the city’s location places it within a transitional zone between the Cumberland Plateau and the flatter alluvial plains of Middle Tennessee. The terrain is predominantly composed of limestone bedrock, resulting in fertile soils supporting a mix of agricultural land and forested areas. Elevation averages around 800 feet above sea level, contributing to a moderate climate and influencing local air circulation patterns. The surrounding landscape is a patchwork of farmland – primarily corn, soybeans, and hay – interspersed with wooded hills and pastures. This agricultural activity, while vital to the regional economy, can contribute to seasonal particulate matter emissions. Lewisburg’s urban footprint is relatively compact, reflecting its small population size, and exhibits a clear urban–rural gradient extending outwards into the surrounding countryside. The city lacks significant proximity to major rivers or lakes, which would otherwise influence humidity and local weather systems. While not directly adjacent to major industrial belts, its position within a commuting radius of Nashville means some influence from that city’s industrial and transportation emissions is possible, particularly during periods of stagnant air. The topography, with its gentle slopes and limited natural barriers, can sometimes trap pollutants, especially during temperature inversions, impacting local air quality.

Lewisburg’s air quality experiences a distinct seasonal cycle driven by meteorological factors and agricultural practices. Spring, while visually appealing, often sees elevated levels of pollen and dust, impacting those with allergies and respiratory sensitivities. Agricultural activities, such as tilling and planting, release particulate matter into the air, contributing to hazy conditions. Summer brings generally good air quality due to increased convective mixing – rising warm air disperses pollutants. However, periods of intense heat can lead to stagnant air conditions, particularly when high-pressure systems settle over the region, trapping pollutants near the ground. Fall is arguably the most challenging season. Harvest activities intensify agricultural emissions, and the cooler temperatures combined with calmer winds frequently lead to temperature inversions. These inversions trap pollutants in a layer close to the ground, exacerbating air quality concerns. Winter, while often cold, can also experience periods of poor air quality due to the stability of the atmosphere and the potential for wood-burning stoves to be used for heating. Fog, common during winter mornings, can also trap pollutants. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should monitor local air quality reports and limit outdoor exertion during periods of elevated particulate matter or ozone. Avoiding outdoor activities during the early morning hours in fall and winter, when inversions are most likely, is advisable. During spring, pollen counts should be carefully monitored.