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AP Enviro



Unit 7

7.3 Thermal Inversion

1 min readmay 29, 2020

Joshua Nielsen


  • Thermal Inversion

  • Inversion Layer


Most cities sit on an open plain. Winds blow through them. The heat from the sun causes hot air to rise. Pollution is, therefore, able to move out of the city.


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Some cities sit within a valley, surrounded by hills or mountains. This impedes the winds that normally blow through. The sun continues to heat the surfaces in the city and the warm air rises. At night, the warm air creates a thermal blanket that traps air pollution.


Image courtesy of Creator

🎥 Watch: AP Environmental Science - Air Pollution


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