This is an old question that is no longer in use.
Images may be missing and the information may be dated.
Which two exhaust substances contribute to the formation of tropospheric ozone?
“Along with nitric oxides, the hydrocarbon emissions contribute to the formation of tropospheric ozone.” (Driving Licence Book, 19th Edition, page 228)
Körkortonline.se offers driving licence theory tests. This is an example of an explanation of a test question. English theory test (free demo), Swedish theory test (free demo) and Arabic theory test (free demo).
More examples of explanations:
Category: