Roswell Air Quality Index (AQI)

Loading live AQI data...

Loading historical AQI trends...

Roswell, Georgia, nestled within the foothills of the Appalachian Mountains, presents a unique geographic context influencing its air quality. Located in Fulton County, approximately 22 miles north of Atlanta, the city occupies a gently rolling terrain characterized by hardwood forests and scattered creeks. Its coordinates (34.0391, -84.3513) place it within the Piedmont region, a transition zone between the mountains and the coastal plain. The Chattahoochee River forms a significant western boundary, offering some natural air filtration but also acting as a potential conduit for pollutant transport. While Roswell has transitioned from a primarily agricultural past to a suburban-urban mix, surrounding areas retain agricultural land, contributing to seasonal particulate matter from farming activities. The proximity to Atlanta’s extensive highway network and industrial corridors is a key factor; prevailing winds often carry emissions from the city southward, impacting Roswell’s air. The urban-rural gradient is pronounced, with denser development concentrated around Canton Street and Old Milton Parkway, creating localized ‘urban heat island’ effects that can exacerbate pollution. Elevation varies, but generally remains between 750 and 1100 feet, influencing atmospheric mixing and dispersion of pollutants. This combination of factors creates a complex air quality landscape.

Roswell’s air quality follows a distinct seasonal pattern. Spring brings increased pollen counts, impacting those with allergies, but generally good air quality due to frequent rainfall washing away pollutants. Summer often sees elevated ozone levels, formed by the reaction of sunlight with vehicle emissions and industrial byproducts, peaking in July and August during hot, stagnant weather. Temperature inversions, common in the humid subtropical climate, trap pollutants near the ground, worsening ozone and particulate matter concentrations. Autumn offers the most favourable air quality, with cooler temperatures, increased wind speeds, and reduced sunlight diminishing ozone formation. However, leaf decomposition and agricultural burning in surrounding areas can temporarily increase particulate matter. Winter, while generally having the lowest ozone levels, can experience periods of poor air quality due to wood burning for heating and potential temperature inversions. Fog, common in the cooler months, can trap pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during summer ozone peaks and winter inversion events. Monitoring local forecasts and adjusting activity levels accordingly is crucial for maintaining respiratory health.