Across
- 4. from complete combustion of fuels
- 6. type of fog, made up of harmful chemicals
- 10. causes irritation to the respiratory system
- 11. formed in the high temperatures of a car engine
Down
- 1. general formula CxHx
- 2. produces a large amount of nirtogen oxide emissions
- 3. what is an issue with sulfur oxides
- 5. has 12 carbons in its chain
- 7. from the incomplete combustion of fuels
- 8. engines can be easily converted to run on this fuel
- 9. only product of its combustion is water
- 12. produces less carbon monoxide, sulfur dioxide and nitrogen oxides than petrol