Apportionment

Section 104(b)(4) of title 23, United States Code, is amended to read as follows:

(4)

Congestion mitigation and air quality improvement program

(A)

Calculation

For the congestion mitigation and air quality improvement program, an amount determined by multiplying the amount of the base apportionment remaining for the State under subsection (c) after making the set aside in accordance with paragraph (5) by the proportion that—(i)the total of all weighted county populations with monitored pollutant concentrations above national ambient air quality standards in the State; bears to(ii)the total of all weighted county populations with monitored pollutant concentrations above national ambient air quality standards in all States.(B)

Calculation of weighted populations with monitored pollution concentrations above national ambient air quality standards

Subject to subparagraphs (C), (D), and (E), for the purpose of subparagraph (A), the weighted population in counties with pollution concentrations above national ambient air quality standards shall be calculated by multiplying the population of each county by a factor determined from the ratio of design values to national ambient air quality standards.(C)

Design values of ozone

(i)

In general

In making the calculation under subparagraph (B), for counties with design values of ozone greater than the national ambient air quality standard, the population of a monitored county is multiplied by a factor of—(I)the average of 2013–2015 and 2016–2018 design values, provided by the Environmental Protection Agency Administrator; bears to(II)the primary national ambient air quality standard for ozone established by the Administrator under 109(b) of the Clean Air Act (42 U.S.C. 7409(b)). (ii)

Special rule

If the average of design values from 2013–2015 and 2016–2018 is not greater than the primary national ambient air quality standard for ozone, a weighting factor of zero is applied.(iii)

Maximum factor

Notwithstanding clauses (i) and (ii), the maximum factor to be applied for ozone shall not exceed 1.4.(D)

Design values of fine particulate matter

(i)

In general

For counties with design values of fine particulate matter greater than the national ambient air quality standards, the population of a monitored county is multiplied by the greater factor of—(I)the average of the 2013–2015 and 2016–2018 design values for annual concentrations of fine particulate matter, provided by the Environmental Protection Agency Administrator; bears to(II)the primary national ambient air quality standard for fine particulate matter for annual concentrations established by the Administrator under 109(b) of the Clean Air Act (42 U.S.C. 7409(b)); or(III)the average of the 2013–2015 and 2016–2018 design values for 24-hour averaging time of fine particulate matter, provided by the Environmental Protection Agency Administrator; bears to(IV)the primary national ambient air quality standard for fine particulate matter for 24-hour averaging time established by the Administrator under 109(b) of the Clean Air Act (42 U.S.C. 7409(b)).(ii)

Special rule

If the average of design values from 2013–2015 and 2016–2018 are not greater than the primary national ambient air quality standards for particulate matter, a weighting factor of zero is applied.(iii)

Maximum factor

Notwithstanding clause (i), the maximum factor to be applied for fine particulate matter shall not exceed 1.4.(E)

Design values of both ozone and particulate matter

Notwithstanding subparagraphs (B) through (D), for counties with design values greater than the national ambient air quality standards for both ozone and particulate matter, a new factor, determined by multiplying the factors determined in subparagraphs (C) and (D), is applied to county populations in place of the individual factors determined in subparagraphs (C) and (D).(F)

Minimum apportionment

Notwithstanding any other provision of this paragraph, the minimum apportionment for a State under this paragraph shall be one half of 1 percent of the funds apportioned under this paragraph.(G)

Maximum apportionment

Notwithstanding any other provision of this paragraph, the maximum apportionment for a State under this paragraph shall be 25 percent of the funds apportioned under this paragraph. (H)

Determinations of population

In determining county population for purposes of this paragraph, the Secretary shall use the latest available annual estimates prepared by the Secretary of Commerce.

Congestion mitigation and air quality improvement program

Section 149 of title 23, United States Code, is amended—(1)in subsection (b)—(A)by striking , carbon monoxide,;(B)by striking 186(a),;(C)by striking 7512(a),;(D)in paragraph (8)(B) by striking ; or and inserting a semicolon;(E)in paragraph (9) by striking the period at the end and inserting ; or; and(F)by adding at the end the following:

(10)other projects, if determined by the Secretary, to be more cost-effective than projects described in paragraphs (1) through (9).

;

(2)in subsection (c) by striking carbon monoxide, or both, and for; and(3)by amending subsection (d) to read as follows:

(d)

States flexibility

If a State does not have, and never has had, a nonattainment area designated under the Clean Air Act (42 U.S.C. 7401 et seq.), the State may use funds apportioned to the State under section 104(b)(4) for any project in the State that—(1)would otherwise be eligible under subsection (b) as if the project were carried out in a nonattainment or maintenance area; or(2)is eligible under the surface transportation block grant program under section 133.