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42 U.S. Code § 7651f. Nitrogen oxides emission reduction program
(a) Applicability
On the date that a coal-fired utility unit becomes an affected unit pursuant to sections 7651c, 7651d,[1] 7651h of this title, or on the date a unit subject to the provisions of section 7651c(d) or 7651h(b) of this title, must meet the SO2 reduction requirements, each such unit shall become an affected unit for purposes of this section and shall be subject to the emission limitations for nitrogen oxides set forth herein.
(b) Emission limitations
(1) Not later than eighteen months after November 15, 1990, the Administrator shall by regulation establish annual allowable emission limitations for nitrogen oxides for the types of utility boilers listed below, which limitations shall not exceed the rates listed below: Provided, That the Administrator may set a rate higher than that listed for any type of utility boiler if the Administrator finds that the maximum listed rate for that boiler type cannot be achieved using low NOx burner technology. The maximum allowable emission rates are as follows:
(A)
for tangentially fired boilers, 0.45 lb/mmBtu;
(B)
for dry bottom wall-fired boilers (other than units applying cell burner technology), 0.50 lb/mmBtu.
After January 1, 1995, it shall be unlawful for any unit that is an affected unit on that date and is of the type listed in this paragraph to emit nitrogen oxides in excess of the emission rates set by the Administrator pursuant to this paragraph.