Details:

Creators:
Schreffler, Eric
Corporate Creators:
ICF International (Firm)
Corporate Contributors:
Federal Highway Administration (U.S.)
Subject/TRT Terms:
[+]
Air Quality Emissions Reduction Environmental Impact Analysis Regulations Strategic Planning Transportation
Publication/ Report Number:
FHWA-HEP-07-004
Resource Type:
Tech Report
Geographical Coverage:
United States
Edition:
Final Report
Corporate Publisher:
Federal Highway Administration (U.S.)
Abstract:
The National Ambient Air Quality Standards (NAAQS) are Federal standards that set the allowable concentrations and exposure limits for certain pollutants. Air quality standards have been established for several pollutants associated with transportation, including carbon monoxide (CO), ozone, and particulate matter (PM-10 and PM-2.5). If monitored levels violate the NAAQS, then the Environmental Protection Agency (EPA), in cooperation with the State, will designate the contributing area as “nonattainment.” In addition to direct pollutant emissions, motor vehicles emit precursors that contribute to pollutant concentrations, including nitrogen oxides (NOx), volatile organic compounds (VOCs), sulfur oxides (SOx), and ammonia (NH3). Transportation is a major source of air pollutant emissions. Nationally, on-road transportation sources are responsible for 27 percent of VOCs emissions, 35 percent of NOx emissions, and 55 percent of CO emissions.1 Although emissions from most transportation sources have been declining for the last two decades, and are projected to continue to decline due to the beneficial effects of improved emission control technologies and more stringent emission regulations, transportation will continue to contribute to regional air pollution for years to come.

Transportation agencies have a long history of implementing strategies to reduce air pollutant emissions. Since 1991, the Congestion Mitigation and Air Quality Improvement (CMAQ) program has devoted more than $14 billion in highway funds for projects that reduce emissions and relieve congestion, most of which have been implemented by transportation agencies.2 Some State Implementation Plans (SIPs) include transportation control measures (TCMs), many of which are implemented by state, regional or local transportation agencies. Thus, there is a wealth of experience implementing emission reduction strategies by transportation agencies.


Format:
PDF
Collection(s):
Federal Highway Administration
Main Document Checksum:
[+]
urn:sha256:6d9ce31d8fd64940a85a937b617bdd6f4556c362eb815e80eb766f0ecebb6039
Download URL:
https://rosap.ntl.bts.gov/view/dot/53683/dot_53683_DS1.pdf
File Type:

Supporting Files

• mpeb.pdf

  pdf

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