Driving theory questions

This is an old question that is no longer in use.

Images may be missing and the information may be dated.

Go to the current theory test questions (2026) >>

Which alternative is something that is dangerous close to the earth’s surface but good higher in the atmosphere?

  • Incorrect: Nitric oxide (NOx)
  • Incorrect: Hydrocarbons (HC)
  • Correct: Ozone
  • Incorrect: Carbon monoxide (CO)

The ozone found high up in the atmosphere protects us from harmful UV radiation. But down on earth, ozone is dangerous. A combination of nitric oxide and hydrocarbons contribute to the formation of ozone.” (Swedish Transport Administration)


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).

More examples of explanations:

Category:



Buy all 1000 questions in English

Free demo »
Driving licence questions – practice theory tests online
  • All 1000 practice questions
  • Unlimited number of tests
  • Start practicing instantly
Swish, Visa, Mastercard