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Kewanee, Illinois, nestled in Henry County, occupies a geographically significant position within the broader Midwest agricultural belt. Located at 41.2399° N, 89.9264° W, the city’s terrain is gently rolling, characteristic of the Illinois River Valley region, with an average elevation of approximately 689 feet above sea level. This relatively low elevation, combined with its position within a broad river valley, can contribute to localized air quality challenges, particularly during periods of temperature inversion. Kewanee sits on the edge of a transition zone – moving from the flatter plains of central Illinois to the more undulating landscapes of western Illinois. The surrounding landscape is predominantly agricultural, dominated by corn and soybean fields, a significant factor influencing regional air quality due to agricultural practices like fertilizer application and tillage. While Kewanee itself is a small urban center, it’s within reasonable driving distance of larger industrial areas in the Quad Cities region, potentially experiencing some downwind impacts from those sources. The urban–rural gradient is quite sharp; the city is immediately bordered by farmland, limiting the urban heat island effect and generally resulting in cooler temperatures compared to larger metropolitan areas. The nearest significant body of water, the Illinois River, is approximately 30 miles to the east, offering some potential for moisture and influencing local weather patterns, though its direct impact on Kewanee’s air quality is limited. The prevailing winds generally flow from the west, carrying air masses across the agricultural plains, which can introduce dust and agricultural pollutants.

Kewanee’s air quality experiences a distinct seasonal cycle heavily influenced by its agricultural surroundings and regional weather patterns. Spring, particularly April and May, often sees elevated particulate matter levels due to agricultural activities – plowing, planting, and fertilizer application release dust and ammonia into the atmosphere. The warming temperatures also increase volatile organic compound (VOC) emissions from vegetation. Summer months, while generally offering improved air quality due to increased convective mixing and rainfall, can occasionally experience stagnant air conditions, especially during heatwaves, leading to ozone formation. The humidity also increases, which can exacerbate respiratory issues for sensitive individuals. Autumn, from September to November, presents a mixed picture. Harvest season contributes to particulate matter pollution, while cooler temperatures can sometimes lead to temperature inversions, trapping pollutants near the ground. Winter, from December to February, is often the most challenging period. Cold, stable air masses, coupled with frequent temperature inversions, can significantly reduce air dispersion, leading to a build-up of pollutants. Fog is also common during these months, further hindering air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions like asthma, should limit prolonged outdoor exertion during periods of stagnant air or temperature inversions, particularly in the spring and winter. Monitoring local weather forecasts and being aware of potential agricultural activity is crucial for informed decision-making regarding outdoor activities.