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Glen Ellyn, Illinois, is a western suburb of Chicago, situated within DuPage County. Its geography is characteristic of the Midwest – a relatively flat, gently rolling landscape sculpted by glacial activity during the last ice age. The area sits atop glacial till, contributing to fertile soil and a network of small streams and tributaries feeding into the DuPage River, which flows nearby. Elevation is modest, averaging around 750-800 feet above sea level. This flatness, while aesthetically pleasing, has implications for air quality; it can contribute to temperature inversions, trapping pollutants near the ground. Glen Ellyn experiences a clear urban-rural gradient. While primarily residential with pockets of commercial development, its proximity to Chicago and the extensive interstate network (I-355 runs close by) introduces significant vehicle emissions. Surrounding the village are agricultural lands to the west and further suburban sprawl extending outwards. The prevailing winds generally come from the west-southwest, meaning pollutants generated in Chicago and upwind agricultural areas can be transported into Glen Ellyn. The lack of significant topographical barriers allows for relatively easy dispersion, but stagnant air masses during certain times of year can exacerbate pollution events. The village’s mature tree canopy offers some localized air purification benefits, but is insufficient to fully mitigate regional pollution sources.

Glen Ellyn’s air quality follows a distinct seasonal pattern. Spring brings increased pollen counts, impacting those with allergies, but generally good air quality as rainfall washes away winter accumulation. Summer often sees higher ozone levels due to increased temperatures and sunlight reacting with vehicle emissions, particularly during periods of stagnant air. July and August are typically the months when ozone concentrations are highest, and sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during peak heat. Autumn offers the cleanest air, with cooler temperatures and increased wind speeds dispersing pollutants. However, agricultural burning in surrounding areas can occasionally lead to localized spikes in particulate matter. Winter presents a different challenge. While temperatures are low, reducing ozone formation, wood burning for heating becomes prevalent, increasing particulate matter (PM2.5) concentrations. Temperature inversions are also common during winter months, trapping pollutants close to the ground. January and February are often the worst months for particulate pollution. Residents with asthma or heart conditions should be particularly cautious during these periods, and consider using air purifiers indoors. Overall, Glen Ellyn’s air quality is heavily influenced by regional weather patterns and emissions sources.