Table 1 Expected and observed ranges of December 2017 “Beijing-like” atmospheric pollutants
Pollutants or components | Observed mean concentration |
|---|---|
Gaseous pollutants | |
Ozone—O3 (ppb) | 6.34 ± 3.59 |
Nitrogen monoxide—NO (ppb) | 2.98 ± 2.19 |
Nitrogen dioxide—NO2 (ppb) | 10.33 ± 4.56 |
Sulfur dioxide—SO2 (ppb) | 5.11 ± 2.65 |
Particulate pollutants | |
PM2.5 | |
Particle number concentration (part/cm3) | 2000–10,000 |
Particle mass concentration (µg/m3) | 105.46 ± 50.34 |
Aerosol chemical composition indicators | |
Sulfates (µg/m3) | 5–8 |
Nitrates (µg/m3) | 5–10 |
Ammonium (µg/m3) | 3–7 |
Organic carbon (OC) (µg/m3) | 15–25 |
Black carbon (BC) (µg/m3) | 3–5 |
Gaseous pollutants | |
Formaldehyde—HCHO | Identified by PTR-MS |
Acetaldehyde—CH3CHO | Identified by PTR-MS |
Acetone—C3H6O | Identified by PTR-MS |
Methylglyoxal or 2-oxopropanal—C3H4O2 | Identified by PTR-MS |
Glyoxal or ethanedial—CHOCHO | Identified by PTR-MS |