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Côte-Saint-Luc, nestled within the Montreal Metropolitan Area of Quebec, Canada, occupies a geographically advantageous position that significantly influences its air quality. Located at approximately 45.47° N, 73.67° W, the city sits on a relatively flat terrain, a legacy of glacial activity that sculpted the surrounding landscape. Its elevation averages around 120 meters (394 feet) above sea level, contributing to a generally stable atmospheric layer, though susceptible to temperature inversions. The city is bordered by the City of Montreal to the north and west, and the Town of Hampstead to the south, creating a dense urban fabric. To the east lies the expansive West Island, a gradual transition from urban development to more suburban and rural areas. The proximity to Lake Saint-Louis, a widening of the St. Lawrence River, plays a crucial role; it can act as a receptor for pollutants, sometimes dispersing them, but also potentially trapping them under certain meteorological conditions. While Côte-Saint-Luc itself is primarily residential, the broader Montreal region hosts significant industrial activity, particularly along the St. Lawrence River corridor, and agricultural zones further west. This urban-rural gradient means that while direct industrial emissions within Côte-Saint-Luc are minimal, the city is still susceptible to regional pollution transport. The prevailing winds, generally from the west and southwest, carry pollutants from industrial areas and agricultural practices, impacting air quality, especially during stagnant weather patterns. The city's dense tree canopy, a deliberate urban planning feature, does offer some localized air purification benefits.

Côte-Saint-Luc’s air quality experiences a distinct seasonal cycle, largely dictated by meteorological patterns. Spring (March-May) often brings a noticeable improvement as snow cover recedes, and warmer temperatures increase atmospheric mixing, dispersing accumulated pollutants. However, agricultural activities in surrounding areas can contribute to elevated levels of particulate matter from soil and fertilizer application. Summer (June-August) typically sees relatively good air quality, with consistent winds and convective mixing. Heatwaves, however, can lead to stagnant air and ozone formation, particularly during sunny days. Autumn (September-November) presents a more complex picture. While cooler temperatures can reduce ozone levels, the increased use of wood-burning stoves for heating, combined with leaf decomposition, can elevate particulate matter concentrations. The most challenging period is often late fall and early winter (November-February). Temperature inversions, where a layer of warm air traps cooler air near the ground, are common, preventing vertical mixing and concentrating pollutants. Fog, frequently occurring during these months, further exacerbates the problem by trapping pollutants close to the surface. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit prolonged outdoor activity during periods of stagnant air or fog. During the warmer months, limiting strenuous outdoor exercise during peak ozone hours (typically mid-afternoon) is advisable. Public health advisories are issued when air quality deteriorates, providing guidance on reducing exposure and protecting vulnerable populations. The city actively monitors air quality and promotes initiatives to reduce emissions from vehicles and residential sources.