Table 2.

Air toxics measures (1990-2007)

Agent	Mean (Standard Deviation)	Inter- Quartile Range	Minimum	10^th Percentile	25^th Percentile	75^th Percentile	90^th Percentile	Maximum
Ortho-xylene (ppbV)	0.478 (0.316)	0.389	0.053	0.169	0.242	0.629	0.950	1.984
Toluene (ppbV)	2.778 (1.684)	2.124	0.337	1.063	1.481	3.604	5.563	10.830
Ethyl Benzene (ppbV)	0.287 (0.168)	0.228	0.100	0.149	0.278	0.436	0.604	1.300
1,3-Butadiene (ppbV)	0.367 (0.175)	0.158	0.022	0.092	0.155	0.384	0.548	0.910
Benzene (ppbV)	1.268 (0.830)	1.197	0.151	0.410	0.591	1.788	2.574	4.600
Meta/para-xylene (ppbV)	0.993 (0.548)	0.616	0.141	0.445	0.599	1.213	1.765	3.791
Styrene (ppbV)	0.159 (0.122)	0.139	0.050	0.053	0.068	0.207	0.350	1.378
Lead (ng/m3)	21.360 (17.488)	18.143	2.318	6.391	8.913	27.174	45.600	87.158
Perchloroethylene (ppbV)	0.186 (0.198)	0.177	0.009	0.035	0.057	0.234	0.487	1.845
Total PAHs (ng/m3)	1.476 (1.128)	1.090	0.164	0.486	0.723	1.814	2.808	12.885
Benzo(k)fluoranthene (ng/m3)	0.109 (0.102)	0.081	0.020	0.035	0.048	0.129	0.210	1.097
Benzo(a)pyrene (ng/m3)	0.214 (0.230)	0.168	0.020	0.053	0.084	0.251	0.445	2.449
Benzo(b)fluoranthene (ng/m3)	0.266 (0.241)	0.202	0.023	0.080	0.120	0.321	0.513	2.519
Indeno(1,2,3-cd)pyrene (ng/m3)	0.318 (0.254)	0.245	0.024	0.097	0.153	0.397	0.607	3.189
Dibenz(a,h)anthracene (ng/m3)	0.036 (0.036)	0.016	0.020	0.020	0.021	0.038	0.058	0.691
Benzo(g,h,i)perylene (ng/m3)	0.559 (0.353)	0.446	0.047	0.191	0.296	0.741	1.058	2.799
Ortho-dichlorobenzene (ppbV)	0.108 (0.040)	0.079	0.050	0.059	0.071	0.150	0.150	0.276
Para-dichlorobenzene (ppbV)	0.144 (0.038)	0.038	0.100	0.100	0.115	0.152	0.188	0.519
Trichloroethylene (ppbV)	0.069 (0.108)	0.043	0.010	0.012	0.016	0.059	0.184	1.021
Carbon tetrachloride (ppbV)	0.105 (0.019)	0.034	0.072	0.084	0.090	0.124	0.132	0.145
Formaldehyde (ppbV)	2.725 (1.135)	1.277	0.744	1.479	1.936	3.212	4.174	8.111
Selenium (ng/m3)	1.533 (0.666)	0.716	0.750	1.000	1.045	1.762	2.421	4.737
Chloroform (ppbV)	0.034 (0.013)	0.016	0.010	0.019	0.025	0.041	0.052	0.126
Chromium (total) (ng/m3)	5.056 (2.478)	3.005	1.182	2.316	3.350	6.350	7.696	30.136
Hexavalent chromium (ng/m3)	0.189 (0.101)	0.135	0.096	0.100	0.110	0.245	0.313	1.514
Acetaldehyde (ppbV)	1.371 (0.661)	0.864	0.286	0.645	0.863	1.727	2.435	4.082
Nickel (ng/m3)	4.851 (2.187)	3.193	1.077	2.304	3.182	6.381	7.726	18.571