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Duncan, Oklahoma, situated at coordinates 34.5408° N, 97.9215° W, occupies a central position within the state’s rolling plains. The city’s elevation, approximately 1,132 feet above sea level, contributes to a continental climate characterized by significant temperature swings. Duncan lies within the Red Bed Plains, a region defined by reddish shale and sandstone formations, influencing local soil composition and drainage patterns. The Washita River meanders nearby, providing a crucial water source but also potentially contributing to localized humidity and fog formation, which can trap pollutants. Surrounding Duncan is a predominantly agricultural landscape, primarily cattle ranching and wheat farming, with some oil and gas activity. Historically, the area was a key part of the Chickasaw Nation. The urban-rural gradient is relatively sharp; the city itself is a regional hub, but quickly transitions to open farmland and pastureland. This proximity to agricultural operations introduces potential sources of particulate matter from tilling and livestock, while oil and gas infrastructure can release volatile organic compounds. The prevailing winds, generally from the south, can transport pollutants from larger urban centers to the east and south, impacting Duncan’s air quality. The relatively flat terrain limits natural dispersion of pollutants, exacerbating localized issues.

Duncan’s air quality follows a distinct seasonal pattern. Spring (March-May) often sees elevated particulate matter due to agricultural activities like plowing and burning of fields, coupled with pollen release. Winds can be erratic, sometimes leading to stagnant air. Summer (June-August) typically experiences the best air quality, with higher temperatures promoting atmospheric mixing and rainfall acting as a natural scrubber. However, ozone formation can be a concern during prolonged heat waves. Autumn (September-November) brings a return of agricultural burning and the potential for temperature inversions, trapping pollutants near the ground. November often sees the first significant cold snaps. Winter (December-February) is characterized by increased wood burning for heating, contributing to particulate matter pollution. Temperature inversions are frequent during these months, particularly on calm, clear nights, creating stagnant air conditions. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during periods of high pollution, especially in November and December. Monitoring local conditions and heeding any health advisories is crucial. The dry climate generally limits fog formation, but when it occurs, it can worsen air quality.