MCQOPTIONS
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| 1. |
The formation of photochemical smog is caused by |
| A. | NOx, CO, HX, O3 |
| B. | NOx, CO2, HC, O3 |
| C. | NOX, Pb, HC, O3 |
| D. | NOX, SOX, HC, O3 |
| Answer» B. NOx, CO2, HC, O3 | |