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Killeen occupies a distinctive position in Central Texas, situated approximately 70 miles north of Austin within the gently rolling terrain of the Texas Blackland Prairies. The city's elevation of approximately 830 feet above sea level places it on the eastern edge of the Edwards Plateau, creating a transitional landscape where prairie grasslands meet the more rugged Hill Country to the west. This geographic setting significantly influences local air quality patterns through several mechanisms. Killeen lies within the Interstate 35 urban corridor, a rapidly developing region stretching from San Antonio to Dallas-Fort Worth, which creates a diffuse pollution plume from vehicle emissions and construction activities. The city's immediate surroundings feature a mix of military installations (notably Fort Hood to the west), agricultural lands producing cotton and sorghum, and expanding suburban development. Unlike coastal cities, Killeen lacks major water bodies for natural air cleansing, with only small creeks like Nolan Creek flowing through the area. The urban-rural gradient shows decreasing pollution levels moving eastward toward more agricultural Bell County areas, while westward movement brings proximity to Fort Hood's military activities. Terrain plays a crucial role as the gently undulating landscape does little to disrupt atmospheric stagnation, allowing pollutants to accumulate during periods of low wind. The city's location away from major industrial centers means it experiences transported pollution from the Dallas-Fort Worth metroplex during prevailing southerly winds, while local sources include increasing vehicular traffic from population growth and occasional agricultural burning in surrounding counties.

Killeen's air quality follows a distinct seasonal pattern shaped by Central Texas' subtropical climate. Spring (March-May) brings variable conditions as increasing temperatures combine with frequent frontal passages. March and April often see the year's best air quality due to consistent northerly winds dispersing pollutants, though occasional dust events from agricultural activities can temporarily degrade conditions. This is the optimal season for outdoor activities, particularly for sensitive groups like those with respiratory conditions. Summer (June-August) presents the greatest challenges as high temperatures (regularly exceeding 95°F) and stagnant high-pressure systems create temperature inversions that trap ozone precursors and particulate matter. July and August typically see the highest pollution levels, with morning traffic emissions reacting with intense sunlight to form ground-level ozone. Sensitive individuals should limit afternoon outdoor exertion during these months. Autumn (September-November) brings gradual improvement as temperatures moderate and increased frontal activity enhances dispersion. October offers particularly favorable conditions with lower humidity and consistent breezes. Winter (December-February) introduces different concerns as cooler temperatures and occasional temperature inversions in river valleys can trap particulate matter from heating sources and vehicle emissions. December and January may see increased fine particles during cold snaps, though overall pollution levels remain lower than summer peaks. Throughout the year, sensitive groups should monitor local air quality forecasts, with particular caution during summer afternoons and winter mornings when inversion conditions are most likely.