Variable (unit) | Mean | Standard Deviation | Minimum/24 hr | Maximum/24 hr | AAQC†| Number of Missing Days | |
---|---|---|---|---|---|---|---|
SO2 (ppb) | London | 3.35 | 2.96 | 0 | 28.63 | Â | 12 |
 | Windsor | 7.36 | 5.06 | 0 | 37.50 | 100/24 hr | 8 |
 | Sarnia | 9.72 | 12.72 | 0 | 110.17 |  | 4 |
NO2 (ppb) | London | 18.10 | 7.86 | 0 | 53 | Â | 54a |
 | Windsor | 23.50 | 7.59 | 6 | 50 | 100/24 hr | 11 |
 | Sarnia | 16.85 | 8.13 | 0 | 52 |  | 100c |
O3 (ppb) | London | 23.61 | 12.50 | 0 | 77 | Â | 7 |
 | Windsor | 20.62 | 12.58 | 0 | 82 | 80/hr | 6 |
 | Sarnia | 25.35 | 11.86 | 0 | 76 |  | 54d |
CO (ppm) | London | 0.16 | 0.30 | 0 | 3 | Â | 9 |
 | Windsor | 0.60 | 0.44 | 0 | 3 | 3/hr | 5 |
 | Sarnia | 0.27 | 0.29 | 0 | 1.4 |  | 87b |