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Dixon, Illinois, is situated in the northwest of the state, nestled within the fertile lands of the Mississippi River Valley. Its coordinates (41.8439, -89.4794) place it in a relatively flat, gently rolling terrain characteristic of the glacial plains. The city straddles the Rock River, a significant waterway that historically served as a transportation corridor and continues to influence local climate and air circulation. Surrounding Dixon is a predominantly agricultural landscape, dominated by corn and soybean farming, with pockets of deciduous forest. This agricultural setting contributes to seasonal particulate matter pollution from tilling and harvesting activities. The urban-rural gradient is fairly sharp; Dixon itself is a moderate-sized city with a population of around 15,166, quickly transitioning to open farmland in all directions. While not directly within a major industrial belt, its proximity to larger manufacturing centers further east and south means it can experience the effects of long-range transport of pollutants. The relatively low elevation (around 700 feet above sea level) and the river valley’s tendency to trap air masses can exacerbate pollution episodes, particularly during periods of stagnant weather. The prevailing winds generally come from the west, carrying pollutants from agricultural sources and potentially from more distant industrial areas.

Dixon’s air quality follows a distinct seasonal pattern. Spring (March-May) often sees elevated particulate matter levels due to agricultural practices – plowing, planting, and the application of fertilizers. Winds can be highly variable, sometimes dispersing pollutants, other times concentrating them. Summer (June-August) typically offers the cleanest air, benefiting from prevailing winds and rainfall that washes away pollutants. However, ozone formation can be a concern on hot, sunny days, particularly downwind of agricultural areas. Autumn (September-November) brings harvest season, again increasing particulate matter, and the onset of temperature inversions, where cooler air becomes trapped beneath warmer air, hindering dispersion. These inversions are most common in late fall and early winter. Winter (December-February) sees the lowest sunlight hours, reducing ozone formation, but increased wood burning for heating can elevate particulate matter concentrations. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during spring and autumn, and be mindful of wood smoke in winter. Monitoring local conditions and heeding any health advisories is crucial. Fog, common in the river valley during cooler months, can also trap pollutants, worsening air quality.