Figure D1 Relationship Between Hourly NO2 Concentrations and Wind Speed Measured at the (a) A-Pad and (b) CD1 Monitoring Stations D1 1-Hour NO2 Background Varying by Wind Speed NO2 Concentration Wind Speed (WS) Category a A-Pad (Isolated Pad) CD1 (Collocated) (m/s) (ppbv) (µg/m3) (ppbv) (µg/m3) WS < 1.54 26.7 50.3 44.5 83.7 1.54 WS < 3.09 24.6 46.2 37.0 69.5 ≤ 3.09 WS < 5.14 17.0 31.9 30.4 57.2 ≤ 5.14 WS < 8.23 12.3 23.2 23.0 43.2 ≤ 8.23 WS < 10.8 8.9 16.7 22.2 41.8 ≤ WS 10.8 13.6 25.5 22.6 42.5 ≥ a AERMOD-default wind categories.
Figure D1 Relationship Between Hourly NO2 Concentrations and Wind Speed Measured at the (a) A-Pad and (b) CD1 Monitoring Stations D1 1-Hour NO2 Background Varying by Wind Speed Wind Speed (WS) Category a (m/s) NO2 Concentration A-Pad (Isolated Pad) CD1 (Collocated) (ppbv) (µg/m3) (ppbv) (µg/m3) WS < 1.54 26.7 50.3 44.5 83.7 1.54 ≤ WS < 3.09 24.6 46.2 37.0 69.5 3.09 ≤ WS < 5.14 17.0 31.9 30.4 57.2 5.14 ≤ WS < 8.23 12.3 23.2 23.0 43.2 8.23 ≤ WS < 10.8 8.9 16.7 22.2 41.8 WS ≥ 10.8 13.6 25.5 22.6 42.5 a AERMOD-default wind categories.