§7423 — Title 42 The Public Health and Welfare | U.S. Code

Summary

Air pollution limits for a source cannot be weakened just because its smokestack is taller than what counts as good engineering practice or because the owner uses other ways to spread emissions. "Dispersion technique" means temporary or extra steps that change how pollution moves. "Good engineering practice" means the stack height needed to keep pollution from building up near the source because of airflow effects from the plant, nearby buildings, or terrain. By six months after August 7, 1977, the Administrator had to make rules after notice and a public hearing. That good-engineering-practice height is normally limited to 2.5 times the source height unless, after notice and hearing, the owner shows a taller stack is needed and the Administrator agrees. The Administrator may not ban raising or otherwise limit stack height.

Title 42, §7423

The Public Health and Welfare — Source: USLM XML via OLRC

(a)The degree of emission limitation required for control of any air pollutant under an applicable implementation plan under this subchapter shall not be affected in any manner by—

(1)so much of the stack height of any source as exceeds good engineering practice (as determined under regulations promulgated by the Administrator), or

(2)any other dispersion technique.

(b)For the purpose of this section, the term “dispersion technique” includes any intermittent or supplemental control of air pollutants varying with atmospheric conditions.

(c)Not later than six months after August 7, 1977, the Administrator, shall after notice and opportunity for public hearing, promulgate regulations to carry out this section. For purposes of this section, good engineering practice means, with respect to stack heights, the height necessary to insure that emissions from the stack do not result in excessive concentrations of any air pollutant in the immediate vicinity of the source as a result of atmospheric downwash, eddies and wakes which may be created by the source itself, nearby structures or nearby terrain obstacles (as determined by the Administrator). For purposes of this section such height shall not exceed two and a half times the height of such source unless the owner or operator of the source demonstrates, after notice and opportunity for public hearing, to the satisfaction of the Administrator, that a greater height is necessary as provided under the preceding sentence. In no event may the Administrator prohibit any increase in any stack height or restrict in any manner the stack height of any source.

Statutory Notes and Related Subsidiaries

Effective Date

Section effective Aug. 7, 1977, except as otherwise expressly provided, see section 406(d) of Pub. L. 95–95, set out as an

Effective Date

of 1977 Amendment note under section 7401 of this title.

§7423 Stack heights

Summary

Title 42, §7423

Notes & Related Subsidiaries

Statutory Notes and Related Subsidiaries

Effective Date

Effective Date

Citations & Metadata