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Windsor, Ontario occupies a distinctive geographic position as Canada's southernmost city, situated directly across the Detroit River from Detroit, Michigan, creating a unique binational urban corridor that profoundly influences its air quality dynamics. The city rests on relatively flat terrain at approximately 190 meters above sea level, positioned within the Great Lakes-St. Lawrence Lowlands region, with the Detroit River flowing along its northern border and Lake Erie lying to the southeast. This location places Windsor within the heavily industrialized Windsor-Quebec City corridor, surrounded by extensive agricultural lands in Essex County, creating a complex urban-rural gradient. The city's immediate proximity to Detroit's industrial facilities, combined with Windsor's own manufacturing sector focused on automotive production, generates significant cross-border pollution transport. The flat topography and river valley setting can trap pollutants during atmospheric inversions, while the moderating influence of the Great Lakes affects local wind patterns and pollution dispersion. Windsor's position downwind of major industrial sources in both Canada and the United States makes it particularly vulnerable to transboundary air pollution, with regional wind patterns often carrying emissions across the international border. The urban heat island effect in this densely populated area further complicates local air chemistry, creating a challenging environment for maintaining good air quality despite regulatory efforts on both sides of the border.

Windsor's air quality follows distinct seasonal patterns shaped by its Great Lakes location and regional industrial activity. During winter, cold temperatures and frequent temperature inversions trap pollutants close to the ground, particularly from heating sources and industrial emissions, creating the year's worst air quality episodes typically between December and February. Sensitive groups should limit prolonged outdoor exposure during these inversion events. Spring brings improved conditions as increasing temperatures and more frequent frontal systems enhance atmospheric mixing, though occasional lake-effect conditions can still cause localized pollution buildup. Summer presents a mixed picture with generally good dispersion from convective activity but increased ground-level ozone formation during hot, stagnant periods, especially in July and August when sunlight interacts with vehicle and industrial emissions. Autumn offers the most consistently favorable conditions as cooler temperatures reduce ozone formation while remaining above inversion-prone winter temperatures, with October typically providing optimal outdoor air quality. Throughout the year, wind direction plays a crucial role, with southerly winds from industrial Ohio Valley sources and westerly winds from Detroit-area facilities periodically elevating pollution levels regardless of season. Sensitive individuals should monitor daily forecasts for wind patterns and avoid outdoor exertion during announced air quality advisories, particularly those related to particulate matter in winter and ozone in summer.