Discuss the percentage of air pollution is caused by cars.

Explanation

### Step-by-Step Solution:

1. **Understanding Air Pollution**:
- Air pollution is primarily caused by the release of harmful gases into the atmosphere. These gases include carbon dioxide (CO2), carbon monoxide (CO), sulfur dioxide (SO2), and nitrogen dioxide (NO2).

2. **Contribution of Motor Vehicles**:
- Motor vehicles, which include cars, scooters, and other engine-driven vehicles, are significant contributors to air pollution. They are responsible for a substantial percentage of harmful emissions.

...