Chapter summary
Maintaining Air Quality, at a glance
Connect atmospheric substances to their sources, effects and possible solutions.
SEC G2 Science K223 / K225 (2027)
Quick revision
Revisit the essentials, then return to an explanation when you need it.
| Issue | Key chemical connection |
|---|---|
| CO poisoning | Incomplete combustion; reduced oxygen transport |
| Acid rain | NO2/SO2 form acids; carbonate stone reacts |
| Greenhouse warming | CO2/CH4 affect outgoing infrared radiation |
Track carbon flows in amount as well as direction: atmospheric CO2 is steady only when additions and removals balance. Biofuel combustion emits CO2 even when plant growth offsets part of the release.
Quick recall
What are the approximate percentages of nitrogen and oxygen in dry air?