Table 2.
Summary of Mean Filter-Based and Nephelometer Measurements at MAPLE Sampling Locations
| Downsview | Halifax | Kelowna | Lethbridge | Sherbrooke | |
|---|---|---|---|---|---|
| Sampling Period (yyyy/mm) | 2017/07 – 2019/08 | 2017/08 –2019/08 | 2017/11 –2019/03 | 2017/08 –2019/08 | 2017/06 –2019/08 |
| Sampled days | 435 | 435 | 134 | 32a | 459 |
| Sampled filters | 68 | 62 | 18 | 39 | 59 |
| Sampled seasonsa | S,F,W,Sp | S,F,W,Sp | F,W,Sp | S,F,W,Sp | S,F,W,Sp |
| Measurements (Mean ± SE) | |||||
| PM2.5 (μg/m3) | 6.8 ± 0.3 | 4.1 ± 0.2 | 3.4 ± 0.8 | 5.7 ± 1.2 | 5.5 ± 0.3 |
| Sulfate (μg/m3) | 1.19 ± 0.07 | 0.68 ± 0.04 | 0.13 ± 0.05 | 0.66 ± 0.05 | 1.35 ± 0.26 |
| Nitrate (μg/m3) | 0.47 ± 0.10 | 0.13 ± 0.01 | 0.03 ± 0.01 | 0.32 ± 0.07 | 0.14 ± 0.03 |
| Ammonium (μg/m3) | 0.37 ± 0.03 | 0.17 ± 0.02 | 0.05 ± 0.02 | 0.23 ± 0.03 | 0.20 ± 0.02 |
| SIA (μg/m3) | 2.0 ± 1.3 | 1.0 ± 0.7 | 0.2 ± 0.1 | 1.2 ± 0.8 | 1.7 ± 1.4 |
| Black carbon (μg/m3) | 0.82 ± 0.06 | 0.36 ± 0.03 | 0.16 ± 0.07 | 0.37 ± 0.06 | 0.49 ± 0.04 |
| Residual matter (μg/m3) | 2.5 ± 0.2 | 1.7 ± 0.2 | 1.1 ± 0.2 | 4.0 ± 1.4 | 2.8 ± 0.3 |
| Dust (μg/m3) | 0.67 ± 0.06 | 0.43 ± 0.06 | 0.30 ± 0.07 | 0.46 ± 0.07 | 0.32 ± 0.03 |
| Sea salt (μg/m3) | 0.55 ± 0.04 | 0.79 ± 0.05 | 0.29 ± 0.03 | 0.39 ± 0.06 | 0.49 ± 0.03 |
| PM10 (μg/m3) | 15.9 ± 1.7 | 8.6 ± 0.6 | 8.6 ± 2.8 | 9.7 ± 3.0 | 11.5 ± 0.8 |
| bsp,24hr,550nm (Mm-1)b | 38.6 ± 1.3 | 16.5 ± 0.5 | 17.2 ± 1.6 | 26.7 ± 1.8 | 24.9 ± 0.7 |
| bsp,overpass,550nm (Mm–1) | 27.9 ± 1.3 | 12.9 ± 0.5 | 12.2 ± 1.1 | 23.3 ± 2.1 | 17.1 ± 0.6 |
| AOD overpass,550nm | 0.18 ± 0.01 | 0.13 ± 0.01 | 0.14 ± 0.02 | 0.14 ± 0.01 | 0.16 ± 0.02 |
| bsp,overpass/ PM2.5,24hr (MSE, m2/g) | 3.12 ± 0.10 | 2.73 ± 0.18 | n/a | 2.96 ± 1.22 | 2.60 ± 0.09 |
a Sampled seasons are S = summer (June, July, August), F = fall (September, October, November), W = winter (December, January, February), and Sp = spring (March, April, May). bsp24hr= total scatter over 24 hours; bsp,overpass = total scatter during satellite overpass; SIA = secondary inorganic aerosol.
b Particle light (550 nm) scattering coefficient in units of 106m-1.