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Number and percentage of sampled hours with PM2.5 >12 μg/m3 in each season and Ångström exponent α values and 95% CI based on mean absorbance at each wavelength during these peak hours.
| Season | Number of hours per season with PM2.5>12 μg/m3 |
% of sampled hours per season with PM2.5>12 μg/m3 |
α(375-880) and 95% CI |
|---|---|---|---|
| Winter | 179 | 21 | 1.6 (1.2-1.9) |
| Spring | 40 | 2 | 1.4 (1.1-1.6) |
| Summer – wildfire | 453 | 59 | 1.6 (1.0-1.8) |
| Summer – no wildfire | 5 | 2 | 1.3 (1.3-1.5) |
| Fall | 162 | 23 | 1.2 (1.0-1.5) |
