Table 3.
Pollutants Examined in Literature Searches 1 and 2
| Type of Pollutant | Percentage of Articles for Literature Search 1 | Percentage of Articles for Literature Search 2 |
|---|---|---|
| Benzo[a]pyrene (B[a]P) | 0.0 | 1.1 |
| Black Carbon (BC) | 1.8 | 0.0 |
| CO | 14.4 | 0.0 |
| Diesel Exhaust Particles (DEP) | 5.4 | 26.1 |
| Distance from major roadway | 0.9 | 0.0 |
| Elemental carbon (EC) | 0.9 | 0.0 |
| Heavy Metals (Pb, Mn, Zn, etc.) | 0.9 | 3.3 |
| Methane (CH4) | 0.9 | 0.0 |
| NO | 3.6 | 1.1 |
| NO2 | 37.8 | 2.2 |
| Non-methane hydrocarbons (NMHC) | 0.9 | 0.0 |
| NOx | 7.2 | 2.2 |
| Nanoscale Particulate Matter or Ultrafine Particulates (nPM/UFP) | 5.4 | 8.7 |
| O2 | 0.9 | 0.0 |
| Organic Carbon (OC) | 0.9 | 1.1 |
| O3 | 27.0 | 26.1 |
| Polycyclic Aromatic Hydrocarbons (PAHs) | 5.4 | 2.2 |
| Peroxyacetyle nitrate (PAN) | 0.9 | 0.0 |
| PM | 0.9 | 8.7 |
| PM10 | 33.3 | 6.5 |
| PM2.5 | 64.9 | 32.6 |
| PM2.5absorbance | 3.6 | 1.1 |
| PM2.5–10 | 0.9 | 2.2 |
| PMcoarse | 1.8 | 1.1 |
| SO2 | 21.6 | 2.2 |
| SO4 | 1.8 | 0.0 |
| Total Hydrocarbons | 1.8 | 0.0 |
| Total Suspended Particles (TSP) | 0.9 | 0.0 |
| Traffic-Related Air Pollution (TRAP) | 1.8 | 6.5 |
| Volatile Organic Compounds (VOCs) | 0.0 | 3.3 |