What you'll learn
What is in the air and how it is polluted.
Key ideas
- Atmospheric composition (78% nitrogen, 21% oxygen).
- Combustion and pollutants: carbon monoxide, sulfur dioxide, particulates.
- Effects: health, acid rain, greenhouse effect.
Exam tips
- Link each pollutant to its problem.
- Distinguish complete and incomplete combustion.
Common mistakes
- Overstating the amount of CO₂.
- Blaming CO₂ for acid rain.