Table 1.
Characterization of Summer 2006 and Winter 2007 APM in Fresno, CA
| Summer 2006 |
Winter 2007 |
|||
|---|---|---|---|---|
| Percent Total Mass | PM1.8 | PM0.1 | PM1.8 | PM0.1 |
| Major species (ppm = %) | ||||
| OC | 23.58% | 41.03% | 16.30% | 27.03% |
| EC | 5.43% | 17.95% | 2.54% | 8.11% |
| NO3 | 6.13% | 15.38% | 31.56% | NA |
| SO4 | 13.76% | 10.26% | 5.66% | 2.70% |
| NH4+ | 3.53% | 0.00% | 10.81% | NA |
| Trace species (ppm = % * 10,000) | ||||
| Fe/57 | 6.99 | 3.33 | 12.95 | NA |
| Cu/63 | 1.24 | 11.54 | 0.65 | 9.73 |
| Zn/66 | 1.29 | 8.72 | 1.12 | 8.38 |
| As/75 | 0.06 | 0.26 | 0.13 | NA |
| Benzo(e)pyrene | 0.0049 | 0.0460 | 0.0143 | NA |
| Benzo(a)pyrene | 0.0042 | NA | 0.0118 | 0.0433 |
| Indeno(1,2,3-cd)pyrene | 0.0090 | 0.0640 | 0.0134 | 0.1441 |
| Benzo(GHI)perylene | 0.0120 | 0.1102 | 0.0098 | 0.0816 |
| Dibenz(ah)anthracene | 0.0112 | NA | 0.0097 | NA |
| Coronene | 0.0114 | 0.1142 | 0.0160 | 0.1058 |
APM, ambient particulate matter; PM, particulate matter; OC, organic carbon; EC, elemental carbon; NA, not available. For details see Ref. 57.