Exposure characteristics
| PM2.5 µg·m−3 | NO ppb | NO2 ppb | NOx ppb | CO ppm | CO2 ppm | TVOC ppb | |
| Diesel exhaust | 260±55 | 3340±2592 | 114±104 | 3450±2597 | 13±3 | 1963±974 | 1407±788 |
| Filtered air | 4±3 | 211±173 | 20±16 | 230±184 | 2±1 | 2147±2476 | 158±110 |
Data are presented as mean±sd. PM2.5: particles with a 50% cut-off aerodynamic diameter of 2.5 µm; NO: nitrogen oxide; NO2: nitrogen dioxide; NOx: oxides of nitrogen; CO: carbon monoxide; CO2: carbon dioxide; TVOC: total volatile organic compounds.