Table 1.
Composition and concentration of different smog components in the air.
| Components of smog | Smog type | Concentration in the air during smog | Reference |
|---|---|---|---|
| Ozone (Ground level) |
Photochemical smog Acidic smog |
Ozone (0.8 ppm) Ozone (0.4 - 0.8 ppm) Ozone (0.8 -1.0 ppm) |
(27) (7) (8) |
| Particulate matter (Surface and volume Concentration) a complex mixture of solid particles and liquid Particulate with a diameter ≤2.5 μm (PM2.5) |
Acid smog Polsih smog Photochemical smog |
Approx. 949649206 μm2/cm3
PM2.5 4.90 to 38.07 ppm PM10 7.61 to 38.49 ppm PM10 10 µg/m3 in Asian cities |
(28) (29) |
| Nitrogen dioxide | Photochemical smog | Approx. 200 ppb | UCAR Center of science education |
| Benzopyrene | Acidic smog | Approx.61.6 ng/m3
Approx. 3.64 ng/m3 |
(9) |
| Carbon monoxide | Photochemical smog Polish smog |
Approx.160 ppm | (29) |
| Carbon black | Acidic smog Polish smog |
More than 20 μg/m3 | (10) |
| Sulphur dioxide | Polish smog Acid smog Photochemical smog |
Approx. 0.75 ppm | (11) |
| Peroxyacetyl Nitrate (PAN) | Acid smog | Approx. 37 ppb | (29) |
| Nitric acid | Polish smog | Approx. 49 ppb | (29) |
| Formic acid | Acidic smog | Approx. 19 ppb | (28) |
| Formaldehyde | Polish smog | Approx. 71 ppb | (28) |
| Phthalate diesters | Acidic smog | 10-100 ng/m-3 | (30) (12) |
| Alkylphenols | Photochemical smog | Approx.1 ng m-3 | (12) |
| Polychlorinated biphenyls (PCBs) | Acidic smog | Approx. 0.1ng m-3 | (12) |
| Biphenol C12H10 |
Photochemical smog Acid smog |
Approx. 0.1ng m-3 | (12) |