### Question
What does manmade air pollution mean?


### Answer
**Manmade air pollution** has the following meaning in *42 U.S.C. § 7491*:

> air pollution which results directly or indirectly from human activities

#### Citation:
  - *42 U.S.C. § 7491*
  - Heading: **SUBCHAPTER I-PROGRAMS AND ACTIVITIES > Subchapter Referred to in Other Sections > Part C-Prevention of Significant Deterioration of Air Quality > subpart ii-visibility protection**

