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Shawnee, Oklahoma, situated at 35.3531°N, -96.9647°W, occupies a central position within the state, approximately 70 miles east of Oklahoma City. The city lies within the Sandstone Hills region, a rolling prairie landscape transitioning towards the more dramatic Cross Timbers further east. Elevation varies gently, generally around 850-900 feet above sea level, influencing local wind patterns and pollutant dispersion. The North Canadian River meanders nearby, providing a crucial hydrological feature but also potentially contributing to humidity and fog formation, which can trap pollutants. Shawnee’s urban character is defined by a blend of residential areas, commercial districts, and light industrial activity, historically linked to the railroad and more recently to manufacturing and distribution. Surrounding the city is a predominantly agricultural zone, dominated by cattle ranching and wheat farming, with associated emissions from agricultural practices. The urban-rural gradient is relatively sharp, meaning pollutant sources are concentrated within the city limits, but regional transport from larger urban centres and agricultural areas can impact air quality. The relatively flat terrain limits natural ventilation, and the lack of significant topographical barriers can allow pollutants to accumulate during stagnant weather conditions. This geographic setting creates a unique interplay of local emissions and regional influences on Shawnee’s air quality.

Shawnee’s air quality follows a distinct seasonal pattern. Spring (March-May) often sees elevated particulate matter from agricultural burning and pollen, exacerbated by moderate winds that can carry these pollutants across the city. Summer (June-August) typically experiences the highest ozone levels due to intense sunlight and high temperatures reacting with vehicle emissions and industrial byproducts. Stagnant air masses are common, increasing the risk of pollution build-up. Autumn (September-November) brings a period of generally improved air quality as temperatures cool and rainfall increases, washing pollutants from the atmosphere. However, early autumn can still experience lingering ozone issues. Winter (December-February) presents a different challenge: temperature inversions, where a layer of warm air traps cooler air near the surface, concentrating pollutants from residential heating sources – primarily wood burning – and vehicle exhaust. Sensitive groups, including children, the elderly, and those with respiratory conditions, should limit strenuous outdoor activity during summer ozone peaks and winter inversion events. Monitoring wind patterns is crucial; southerly winds can bring pollutants from Oklahoma City, while northerly winds may transport agricultural emissions. Months to favour for outdoor activity are generally April, May, and October.