# § 7476. Other pollutants
**(a)** **Hydrocarbons, carbon monoxide, petrochemical oxidants, and nitrogen oxides** August 7, 1977August 7, 1977
In the case of the pollutants hydrocarbons, carbon monoxide, photochemical oxidants, and nitrogen oxides, the Administrator shall conduct a study and not later than two years after , promulgate regulations to prevent the significant deterioration of air quality which would result from the emissions of such pollutants. In the case of pollutants for which national ambient air quality standards are promulgated after , he shall promulgate such regulations not more than 2 years after the date of promulgation of such standards.
**1** **Effective date of regulations** [^1]section 7410 of this title
Regulations referred to in subsection (a) shall become effective one year after the date of promulgation. Within 21 months after such date of promulgation such plan revision shall be submitted to the Administrator who shall approve or disapprove the plan within 25 months after such date or promulgation in the same manner as required under .
So in original. Probably should be “of”.
**(c)** **Contents of regulations** section 7470 of this title
Such regulations shall provide specific numerical measures against which permit applications may be evaluated, a framework for stimulating improved control technology, protection of air quality values, and fulfill the goals and purposes set forth in section 7401 and .
**(d)** **Specific measures to fulfill goals and purposes** section 7473 of this title
The regulations of the Administrator under subsection (a) shall provide specific measures at least as effective as the increments established in to fulfill such goals and purposes, and may contain air quality increments, emission density requirements, or other measures.
**(e)** **Area classification plan not required** section 7410(c) of this titlesection 7470 of this title
With respect to any air pollutant for which a national ambient air quality standard is established other than sulfur oxides or particulate matter, an area classification plan shall not be required under this section if the implementation plan adopted by the State and submitted for the Administrator’s approval or promulgated by the Administrator under contains other provisions which when considered as a whole, the Administrator finds will carry out the purposes in at least as effectively as an area classification plan for such pollutant. Such other provisions referred to in the preceding sentence need not require the establishment of maximum allowable increases with respect to such pollutant for any area to which this section applies.
**(f)** **PM–10 increments** section 7473(b) of this titlesection 7475(d)(2)(C)(iv) of this title
The Administrator is authorized to substitute, for the maximum allowable increases in particulate matter specified in and , maximum allowable increases in particulate matter with an aerodynamic diameter smaller than or equal to 10 micrometers. Such substituted maximum allowable increases shall be of equal stringency in effect as those specified in the provisions for which they are substituted. Until the Administrator promulgates regulations under the authority of this subsection, the current maximum allowable increases in concentrations of particulate matter shall remain in effect.
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**Source Credit**: (July 14, 1955, ch. 360, title I, § 166, as added Pub. L. 95–95, title I, § 127(a), Aug. 7, 1977, 91 Stat. 739; amended Pub. L. 101–549, title I, § 105(b), Nov. 15, 1990, 104 Stat. 2462.)
## Editorial Notes
### Amendments
1990—Subsec. (f). added subsec. (f).