Table 1.
Summary of experiments and results.
| Lights OFF | Lights ON | Mutagenic Potencyb | ||||||
|---|---|---|---|---|---|---|---|---|
| Precursor VOC | VOC (ppmC) | NO (ppbv) | VOC (ppmC) | NO (ppbv) | NO2 (ppbv) | O3 (ppbv) | rev h−1 ± SE | rev m3 mgC−1 h−1 ± SE |
| benzene | 12.66 | 180 | 10.52 | 2 | 44 | 48a | 5.0 ± 0.6 | 5.2 ± 0.7 |
| toluene | 6.05 | 304 | 3.52 | 0 | 116 | 189 | 12.0 ± 0.7 | 10.4 ± 0.6 |
| ethylbenzene | 6.48 | 266 | 4.43 | 1 | 130 | 159 | 10.7 ± 0.8 | 11.4 ± 0.9 |
| o-xylene | 7.58 | 395 | 4.19 | 1 | 219 | 294 | 11.0 ± 0.8 | 7.2 ± 0.6 |
| m-xylene | 5.53 | 293 | 2.30 | 0 | 172 | 256 | 7.4 ± 0.8 | 4.9 ± 0.6 |
| p-xylene | 7.75 | 416 | 4.44 | 0 | 175 | 260 | 3.1 ± 0.6 | 2.0 ± 0.4 |
| 1,2,4-TMB | 7.12 | 392 | 3.99 | 1 | 249 | 309 | 7.1 ± 1.0 | 4.8 ± 0.7 |
| 1,3,5-TMB | 7.78 | 363 | 4.78 | 0 | 272 | 285 | 10.7 ± 1.2 | 7.7 ± 0.9 |
| m-cresol | 0.71 | 87 | 0.07 | 3 | 32 | 48 | 0 | 0 |
| naphthalene | 1.31 | 205 | 0.39 | 66 | 96 | 0 | 0 | 0 |
| clean air | - | 0 | - | 6 | 6 | 0 | 0 | 0 |
a
We were unable to collect O3 data for the benzene-exposure experiment. In order to place approximate bounds on the O3, the experiment was repeated with similar initial conditions, but additional cell exposures were not performed. The value provided here was from this repeated experiment.
b
Zero was used to represent the mutagenic potency when the slopes in Figure 1 were not significantly greater than zero.