Assessing Outdoor Air Near Schools
Revised Data for St. Helens Elementary School
EPA has replaced some data that previously were incorrectly reported. The changes are below. All values are shown in micrograms per cubic meter.
| Sample Date | Pollutant | Original Value |
Revised Value |
| Oct. 06, 2009 | Carbon tetrachloride | 0.799 | 0.692 |
| Oct. 06, 2009 | Chloromethane | 1.265 | 1.006 |
| Oct. 06, 2009 | Methyl chloroform | 0.082 | 0.076 |
| Oct. 06, 2009 | Methyl isobutyl ketone | 0.402 | 0.393 |
| Oct. 10, 2009 | Acetonitrile | 0.331 | 0.321 |
| Oct. 16, 2009 | 1,3-Butadiene | 0.126 | 0.108 |
| Oct. 16, 2009 | Acetonitrile | 0.277 | 0.212 |
| Oct. 16, 2009 | Bromomethane | 0.054 | 0.039 |
| Oct. 16, 2009 | Carbon disulfide | 0.078 | 0.072 |
| Oct. 16, 2009 | Carbon tetrachloride | 0.913 | 0.667 |
| Oct. 16, 2009 | Chloroethane | 0.050 | 0.045 |
| Oct. 16, 2009 | Chloroform | 0.171 | 0.151 |
| Oct. 16, 2009 | Chloromethane | 1.570 | 0.831 |
| Oct. 16, 2009 | Dichloromethane | 0.570 | 0.553 |
| Oct. 16, 2009 | Methyl chloroform | 0.093 | 0.076 |
| Oct. 16, 2009 | Methyl isobutyl ketone | 0.123 | 0.094 |
| Oct. 16, 2009 | o-Xylene | 0.291 | 0.282 |
| Oct. 16, 2009 | Tetrachloroethylene | 0.176 | 0.163 |
| Oct. 28, 2009 | Carbon disulfide | 0.065 | 0.056 |
| Oct. 28, 2009 | Dichloromethane | 0.570 | 0.563 |
| Oct. 28, 2009 | Methyl isobutyl ketone | 0.439 | 0.393 |
| Nov. 03, 2009 | Ethylbenzene | 0.382 | 0.352 |
| Nov. 03, 2009 | Methyl isobutyl ketone | 0.107 | 0.102 |
| Nov. 03, 2009 | Toluene | 2.798 | 2.511 |