This study examines the factors contributing to air pollution in Tehran and its impacts on the environment and human health. Motor vehicles are the largest source of pollution, contributing up to 70% of emissions. Other sources include industrial activities and specific weather conditions like temperature inversions. Air pollution in Tehran exceeds permitted levels, with pollutants like SO2, NO2, CO and lead strongly correlated with increased respiratory issues. Recommendations include reducing vehicle usage, improving public transportation, restricting urban growth, and transferring industrial activities outside the city.

2. The factors affecting air pollution.

3. The impacts of air pollution on the environment.

4. Conclusions and applied solutions to the environmental problems.

6. Motor vehicles;

7. Factories;

8. Specific conditions of weather parameters; and

10. Changing fuel of cars and vehicles into natural gas;

11. Making further use of electrically–driven transportation means(like trams);

12. Using fuel that create lower amount of pollution (like lead–free gasoline) ; and

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