Matane Air Quality Index (AQI)

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Matane, nestled on the southern shore of the St. Lawrence River in Quebec, Canada, occupies a unique geographic position. Located at 48.8500°N, -67.5333°W, the city’s terrain is characterized by rolling hills transitioning to the coastal plain. The Matane River flows through the city, emptying into the St. Lawrence, creating a significant fluvial influence on local microclimates. The surrounding landscape is a blend of boreal forest and agricultural land, with dairy farming and berry cultivation being prominent. This mix introduces potential sources of particulate matter and ammonia. Matane’s position within the St. Lawrence Valley means it’s exposed to prevailing westerly winds, which can transport pollutants from upstream sources. While not a heavily industrialized zone, the presence of regional pulp and paper mills and transportation corridors (Highway 20) contribute to background pollution levels. The urban-rural gradient is relatively sharp; the city centre gives way quickly to forested areas and farmland. This proximity to natural areas generally aids in dispersion, but temperature inversions, common in valleys during winter, can trap pollutants near the ground, exacerbating air quality issues. The river itself moderates temperatures, but also contributes to humidity and potential fog formation, influencing pollutant behaviour.

Matane’s air quality follows a distinct seasonal pattern. Spring (March-May) often sees elevated particulate matter from agricultural activities – tilling and fertilizer application – combined with lingering winter pollutants trapped by melting snow and ice. Winds begin to pick up, offering some relief, but temperature inversions can still occur. Summer (June-August) generally offers the best air quality, benefiting from prevailing winds and increased atmospheric mixing. However, wildfires in neighbouring provinces can occasionally impact Matane, introducing significant smoke. Autumn (September-November) brings a decline in air quality as heating systems are activated, increasing emissions of combustion byproducts. Fog, common along the St. Lawrence, can trap pollutants, reducing visibility and impacting respiratory health. Winter (December-February) is typically the period of poorest air quality. Cold temperatures promote stable atmospheric conditions, leading to frequent temperature inversions that trap pollutants from residential heating and vehicle exhaust. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during prolonged cold spells and periods of fog. Monitoring wind direction is crucial, as winds from the west can bring pollutants from more industrialized areas further inland.