Table 1.

Population distribution and population-weighted exposure distribution for six criteria pollutants for four main racial/ethnic groups and the national average in year 2010.

Demographic	Non-Hispanic White	Non-Hispanic Black	Hispanic	Non-Hispanic Asian	Entire population
Proportion of population	64%	12%	16%	4.6%	100%
${\mathrm{PM}}_{2.5}$ (${\mathrm{\mu }\mathrm{g}/\mathrm{m}}^3$)
10th percentile	6.1	7.9	6.5	6.7	6.3
25th percentile	7.7	9.2	7.7	8.2	7.9
50th percentile	9.3	10	9.6	9.7	9.5
Mean (SD)	9.1 (2.2)	10 (1.8)	9.4 (2.2)	9.4 (1.9)	9.3 (2.2)
75th percentile	11	11	11	11	11
90th percentile	12	13	12	12	12
${\mathrm{NO}}_2$ (ppb)
10th percentile	3.1	3.8	4.6	5.4	3.4
25th percentile	4.3	5.8	6.6	7.5	4.9
50th percentile	6.2	8.7	9.5	10	7.4
Mean (SD)	7.2 (4.1)	9.7 (5.3)	11 (6.1)	12 (5.9)	8.7 (5.1)
75th percentile	8.9	12	15	15	11
90th percentile	12.5	18	21	21	16
${\mathrm{O}}_3$ (ppb)
10th percentile	38	39	33	39	38
25th percentile	43	43	42	44	43
50th percentile	47	47	46	47	47
Mean (SD)	46 (6.0)	46 (6.1)	45 (7.2)	46 (5.9)	46 (6.2)
75th percentile	50	50	49	50	50
90th percentile	52	53	52	53	52
${\mathrm{SO}}_2$ (ppb)
10th percentile	0.91	1.0	0.83	0.79	0.95
25th percentile	1.1	1.2	1.0	1.0	1.2
50th percentile	1.5	1.6	1.3	1.2	1.5
Mean (SD)	1.6 (0.65)	1.7 (0.63)	1.4 (0.55)	1.4 (0.58)	1.6 (0.64)
75th percentile	1.9	2.1	1.7	1.7	2.0
90th percentile	2.4	2.5	2.2	2.3	2.5
${\mathrm{PM}}_{10}$ (${\mathrm{\mu }\mathrm{g}/\mathrm{m}}^3$)
10th percentile	12	14	15	14	13
25th percentile	14	16	17	16	15
50th percentile	17	19	20	19	18
Mean (SD)	18 (4.4)	19 (3.7)	21 (4.9)	20 (4.5)	18 (4.6)
75th percentile	21	21	23	22	22
90th percentile	23	23	28	25	24
CO (ppm)
10th percentile	0.23	0.25	0.26	0.27	0.24
25th percentile	0.27	0.29	0.30	0.30	0.28
50th percentile	0.31	0.32	0.34	0.34	0.31
Mean (SD)	0.30 (0.057)	0.32 (0.067)	0.35 (0.079)	0.35 (0.071)	0.31 (0.066)
75th percentile	0.33	0.35	0.39	0.38	0.35
90th percentile	0.37	0.40	0.45	0.45	0.39

Note: CO, carbon monoxide; ${\mathrm{NO}}_2$, nitrogen dioxide; ${\mathrm{O}}_3$, ozone; ${\mathrm{PM}}_{2.5}$, fine particulate matter with aerodynamic diameter less than or equal to $2.5\text{\hspace{0.17em}micrometers}$; ${\mathrm{PM}}_{10}$ $10\text{\hspace{0.17em}micrometers}$, SD, standard deviation; ${\mathrm{SO}}_2$, sulfur dioxide.