### Question
What is the definition of major source?


### Answer
The definition of **major source** is as follows in *42 U.S.C. § 7412*:

> any stationary source or group of stationary sources located within a contiguous area and under common control that emits or has the potential to emit considering controls, in the aggregate, 10 tons per year or more of any hazardous air pollutant or 25 tons per year or more of any combination of hazardous air pollutants

#### Citation:
  - *42 U.S.C. § 7412*
  - Heading: **SUBCHAPTER I-PROGRAMS AND ACTIVITIES > Subchapter Referred to in Other Sections > Amendments**

