---
kind: "section"
citation: "42 U.S.C. § 7430"
title: "42"
title_heading: "The Public Health and Welfare"
number: "7430"
heading: "Emission factors"
release: "119-102"
date: "2026-07-12"
url: "https://uscodex.org/usc/42/7430"
units:
  - "Chapter 85 — Air Pollution Prevention and Control"
  - "Subchapter I — Programs and Activities"
  - "Part A — Air Quality and Emission Limitations"
---

# §7430. Emission factors


Within 6 months after November 15, 1990, and at least every 3 years thereafter, the [Administrator](/usc/42/7602.md?p=a) shall review and, if necessary, revise, the methods (“emission factors”) used for purposes of this chapter to estimate the quantity of emissions of carbon monoxide, volatile organic compounds, and oxides of nitrogen from sources of such [air pollutants](/usc/42/7602.md?p=g) (including area sources and mobile sources). In addition, the [Administrator](/usc/42/7602.md?p=a) shall establish emission factors for sources for which no such methods have previously been established by the [Administrator](/usc/42/7602.md?p=a). The [Administrator](/usc/42/7602.md?p=a) shall permit any [person](/usc/42/7602.md?p=e) to demonstrate improved emissions estimating techniques, and following approval of such techniques, the [Administrator](/usc/42/7602.md?p=a) shall authorize the use of such techniques. Any such technique may be approved only after appropriate public participation. Until the [Administrator](/usc/42/7602.md?p=a) has completed the revision required by this section, nothing in this section shall be construed to affect the validity of emission factors established by the [Administrator](/usc/42/7602.md?p=a) before November 15, 1990.


## Source credit

(July 14, 1955, ch. 360, title I, § 130, as added Pub. L. 101–549, title VIII, § 804, Nov. 15, 1990, 104 Stat. 2689.)