Public transportation projects proposed for federal funding must meet the requirements of the Clean Air Act (42 USC § 85) in
addition to NEPA. The purpose of the Clean Air Act is to protect and enhance air quality to promote public health and welfare of the nation. To accomplish this, the Act addresses criteria air pollutants that are regulated through the National Ambient Air Quality Standards (NAAQS). Following is a discussion which defines air quality conformity and which transportation-related pollutants are studied to determine conformity. What is air quality conformity? The transportation-related pollutants are: The conformity requirements for transportation are found in Section 176(c) of the Clean Air Act (42 USC § 7506(c)). The U.S. Environmental Protection
Agency (EPA) regulation to implement the requirements is found at 40 CFR Part 93. What is project-level conformity? This conformance requirement is explained in the EPA conformity regulation in 40 CFR § 93.114 and § 93.115. Under the FHWA-FTA metropolitan planning regulation, FTA only recognizes the currently conforming MTP and TIP. A project is included in the MTP if:
The transit project must not cause or contribute to any air quality hotspots. This requirement is explained in the EPA conformity regulation at 40 CFR § 93.116. A hot spot is a small geographic area within the metropolitan area, such as the vicinity of a congested highway intersection, where pollutant emissions build up to a level that exceeds the NAAQS for that pollutant. A short distance from the hot spot, the pollutant concentration is much lower because the pollutant disperses as it drifts away from its source within the hot spot. This requirement applies only to projects that are located in a nonattainment or maintenance area for CO, PM2.5, or PM10. The other transportation pollutants (ozone and nitrogen dioxide) are regional in nature and do not form hot spots. For example, ozone is created by a chemical reaction of NMHC, NOx, and other precursors that is driven by energy from the sun on a hot summer day, so there is no high concentration of ozone near the source of its precursors. CO and small particulates, on the other hand, are relatively chemically inert and can build up to a high concentration near a source. What is a carbon monoxide hot-spot analysis? What is PM2.5 and PM10 hot-spot analysis? EPA released final guidance for quantitative modeling of the localized PM2.5 and PM10 impacts of certain transportation projects in December 2010. The guidance describes how to estimate project emissions using EPA’s MOVES model, California’s EMFAC model, and other methods. It also outlines how to apply air quality models (such as AERMOD and CAL3QHCR) for PM hot-spot analyses. After a two-year grace period which began on December 20, 2010, the guidance is to be used by transit agencies to conduct quantitative PM hot-spot analyses for transit projects that involve significant diesel emissions. Until then, a diesel transit project requiring a PM hot-spot analysis can use the qualitative method previously described. EPA and USDOT will host training and webinars on the new PM hot-spot guidance during the two-year grace period. What should the air quality section of my environmental document look like? If the project is in a nonattainment or maintenance area for a transportation-related pollutant, then one of the purposes of the project determined during scoping may be to improve air quality. If air quality improvement is an explicit purpose of the project, then the environmental document should present, for each alternative, an estimate of the emissions reduction for each transportation-related pollutant or precursor for which the area is a nonattainment or maintenance area. The document would include in the evaluation of alternatives a comparison that shows for each alternative the change in emissions from the amount produced by the future No Build (or No Action) alternative. If the project is in a nonattainment or maintenance area for one or more transportation-related pollutants, then the air quality section of the environmental document would also include the following:
What is the Congestion
Mitigation and Air Quality Improvement (CMAQ) Program? Additional Resources: Information on Dispersion Modeling approved by EPA EPA guidance on Using MOVES in Project-Level Carbon Monoxide Analyses Transportation Conformity Guidance for Qualitative Hot-Spot Analyses in PM2.5 and PM10 Nonattainment and Maintenance Areas and its supplement EPA’s Final Guidance on Quantitative Modeling of PM2.5 and PM10 Hot Spots Last updated: Friday, December 29, 2017 What are the 3 major provisions of the Clean Air Act?Adopt specified transportation control measures. Implement an oxygenated fuels program for all vehicles in the area. Reduce definition of a major source of CO from emissions of 100 tons per year to 50 tons per year if stationary sources contribute significantly to the CO problem.
Which of the following is known as the Clean Air Act?Republic Act No. 8749, otherwise known as the Philippine Clean Air Act, is a comprehensive air quality management policy and program which aims to achieve and maintain healthy air for all Filipinos.
Which of the following is the purpose of the Clean Air Act?The Clean Air Act gives the Environmental Protection Agency the necessary tools to protect our families from a number of harmful pollutants that can cause asthma and lung disease – especially in children. Weakening these standards would allow more pollution in the air we breathe and threaten our children's health.
Which of the following best describes one way the Clean Air Act reduce air pollution?The correct answer is A. The CAA has successfully managed to reduce the levels of toxic and criteria pollutants because the U.S is experiencing minimal cases of premature deaths caused by respiratory illnesses. Moreover, since the implementation of the Act, it has reduced surface ozone levels over the years.
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