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Memphis, Tennessee occupies a strategic position on the Mississippi River's fourth Chickasaw Bluff, where the river's broad floodplain meets higher ground at approximately 337 feet above sea level. This elevation provides natural drainage but places the city within a topographic bowl that can trap pollutants. Situated in the Mississippi Alluvial Plain, Memphis lies at the convergence of three states—Tennessee, Arkansas, and Mississippi—creating a tri-state metropolitan area with significant cross-border traffic and industrial activity. The city's urban character blends historic riverfront districts with sprawling suburban development, creating a pronounced urban-rural gradient where agricultural lands from the Mississippi Delta region meet urban emissions. Proximity to the Mississippi River historically made Memphis a transportation and logistics hub, with ongoing industrial activity along river corridors contributing to regional pollution. The surrounding landscape consists of flat to gently rolling terrain with extensive agricultural zones to the west in Arkansas's Delta region, while to the east lie the forested hills of West Tennessee. This geography creates a complex airshed where urban emissions from transportation and industry mix with agricultural particulates and biogenic emissions from surrounding forests, while the river's moisture can enhance secondary pollutant formation under certain meteorological conditions.

Memphis experiences distinct seasonal air quality patterns shaped by its humid subtropical climate. Winter months, particularly December through February, often see elevated particulate matter levels due to increased residential heating emissions, temperature inversions that trap pollutants in the river valley, and occasional stagnant air masses. These conditions can be problematic for those with respiratory conditions, who should monitor air quality forecasts and limit prolonged outdoor exertion during inversion episodes. Spring brings variable conditions—March and April may experience pollen-driven particulate increases alongside occasional temperature inversions, while May typically sees improving dispersion as frontal systems become more frequent. Summer presents the most complex air quality picture, with June through August featuring high ozone levels driven by intense sunlight, high temperatures, and emissions from transportation and industry. Morning hours often offer better conditions before ozone peaks in afternoon heat. Autumn generally provides Memphis's cleanest air, particularly October and November, when cooler temperatures reduce ozone formation while increased wind and precipitation help clear pollutants. Sensitive groups should be particularly cautious during summer ozone episodes and winter inversion events, planning outdoor activities for mornings or days following frontal passages when air quality typically improves.