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Distinguish, differentiate, compare and explain what is the difference between Classical (Industrial) Smog and Photochemical Smog. Atmospheric Chemistry Guide.
Classical (Industrial) Smog vs. Photochemical Smog
| Parameter | Classical / Industrial Smog (London Smog) | Photochemical Smog (Los Angeles Smog) |
| Primary Causes & Emissions | Burning of high-sulfur coal and heavy fuel oil in industrial boiler plants. | Automobile internal combustion exhaust emissions (unburned hydrocarbons and nitrogen oxides). |
| Major Chemical Components | Sulfur dioxide (SO2), smoke particulates, and sulfuric acid aerosols. | Ozone (O3), Peroxyacetyl Nitrate (PAN), formaldehyde, and nitrogen dioxide (NO2). |
| Climatic Conditions | Occurs in cool, humid, and foggy winter weather conditions. | Occurs in warm, dry, and intensely sunny summer weather conditions. |
| Redox Nature | Chemically reducing in nature (rich in sulfur dioxide). | Chemically oxidizing in nature (high concentration of oxidizing ozone and PAN). |
| Health Impacts | Severe bronchial irritation, bronchial spasms, and acute respiratory distress. | Intense eye tearing/irritation (from PAN), throat burning, and vegetation damage. |
