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Bourbonnais, Illinois, sits within the expansive Prairie Parkland region of the Midwest, a landscape historically defined by tallgrass prairies interspersed with oak savannas. Located in Kankakee County, the city’s geography is characterized by relatively flat terrain, a legacy of glacial activity during the last Ice Age. The elevation hovers around 750 feet above sea level, contributing to good drainage but also limited natural dispersion of pollutants. Bourbonnais benefits from proximity to the Kankakee River, though this also introduces potential for localized humidity and fog formation, which can trap pollutants. The surrounding area is a mix of agricultural land – primarily corn and soybean fields – and increasingly, suburban development linked to its location along the I-57 corridor, connecting Chicago to southern Illinois. This corridor acts as a significant transportation artery, bringing with it vehicle emissions. The urban-rural gradient is pronounced; Bourbonnais is a growing suburban center, but still retains significant agricultural buffers. This blend impacts air quality, with agricultural practices contributing to particulate matter and ammonia, while transportation is a major source of nitrogen oxides and volatile organic compounds. The prevailing winds generally flow from the southwest, potentially carrying pollutants from larger industrial centers to the west and northwest.

Bourbonnais experiences a distinct four-season climate, profoundly influencing its air quality. Spring brings increased agricultural activity, leading to higher levels of particulate matter from tilling and fertilizer application. Pollen counts also surge, impacting those with allergies. Summer often sees stagnant air masses, particularly during periods of high humidity, exacerbating ozone formation from vehicle emissions. July and August are typically the months with the highest ozone levels. Autumn offers a reprieve, with cooler temperatures and increased wind speeds aiding in pollutant dispersion. However, agricultural burning can temporarily degrade air quality in October and November. Winter presents a different challenge. Temperature inversions, where a layer of warm air traps cooler air near the surface, are common, concentrating pollutants from heating sources – primarily residential wood burning and vehicle exhaust. January and February often see the poorest air quality due to these inversions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit strenuous outdoor activity during peak pollution periods in summer and winter. Monitoring local forecasts and adjusting activity levels accordingly is crucial for protecting health.