Table 1.

Central Phoenix mean and range of daily pollutant concentrations during the pre-SAH and SAH time periods for 2020, 2019, and 2018.

		Pre-SAH			SAH
		CO/BLH (ppm/m)	NO2/BLH (ppb/m)	PM10 (μg/m3)	CO/BLH (ppm/m)	NO2/BLH (ppb/m)	PM10 (μg/m3)
2020	Mean	0.0025	0.088	29.3	0.0009	0.022	21.3
	Range	0.0004–0.0090	0.011–0.284	7.1–79.9	0.0003–0.0017	0.006–0.050	6.9–35.6
2019	Mean	0.0018	0.0849	25.2	0.0005	0.026	30.0
	Range	0.0001–0.0077	0.008–0.274	6.6–48.9	0.0001–0.0017	0.005–0.091	13.4–54.0
2018	Mean	0.0022	0.088	34.8	0.0005	0.024	32.0
	Range	0.0002–0.0060	0.009–0.284	10.5–118.5	0.0002–0.0011	0.006–0.057	16.7–47.4