Collocated comparisons of continuous and filter-based PM2.5 measurements at Fort McMurray, Alberta, Canada.

A decreasing trend was found in PM 2.5 (Mann–Kendall analysis: p < 0.001) with a Sen’s slope of –4.6 × 10 −4 μg m −3 day −1 and a seasonal Sen’s slope of –0.15 μg m −3 year −1 .

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