### Question
What is the definition of manmade air pollution?


### Answer
The definition of **manmade air pollution** is as follows in *42 U.S.C. § 7491*:

> air pollution which results directly or indirectly from human activities

#### Citation:
  - *42 U.S.C. § 7491*
  - Heading: **CHAPTER 85-AIR POLLUTION PREVENTION AND CONTROL > SUBCHAPTER I-PROGRAMS AND ACTIVITIES > Part C-Prevention of Significant Deterioration of Air Quality > subpart ii-visibility protection**

