Tuesday, July 26, 2011

NAAQS Statutory Requirements

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From 42 U.S.C. §7409 (Chapter 85, Subchapter I, Part A; CAA §109)


(b) Protection of public health and welfare 
 
(1) National primary ambient air quality standards, prescribed under subsection (a) of this section shall be ambient air quality standards the attainment and maintenance of which in the judgment of the Administrator, based on such criteria and allowing an adequate margin of safety, are requisite to protect the public health. Such primary standards may be revised in the same manner as promulgated. 
 
(2) Any national secondary ambient air quality standard prescribed under subsection (a) of this section shall specify a level of air quality the attainment and maintenance of which in the judgment of the Administrator, based on such criteria, is requisite to protect the public welfare from any known or anticipated adverse effects associated with the presence of such air pollutant in the ambient air. Such secondary standards may be revised in the same manner as promulgated. 

40 CFR 50.2 says:

(b) National primary ambient air quality standards define levels of air quality which the Administrator judges are necessary, with an adequate margin of safety, to protect the public health. National secondary ambient air quality standards define levels of air quality which the Administrator judges necessary to protect the public welfare from any known or anticipated adverse effects of a pollutant. Such standards are subject to revision, and additional primary and secondary standards may be promulgated as the Administrator deems necessary to protect the public health and welfare. 


I expected to see language about protecting sensitive populations but didn't. The only place that language is used (that I found during this quick investigation) is at 42 U.S.C. §7408(f)(1)(C) under the heading "Information regarding processes, procedures, and methods to reduce or control pollutants in transportation; reduction of mobile source related pollutants; reduction of impact on public health."It requires "information on other measures which may be employed to reduce the impact on public health or protect the health of sensitive or susceptible individuals or groups."
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Tuesday, July 12, 2011

FAA Regulations Regarding Tall Stacks

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This regulation describes when and how one needs to consult with the FAA before building a tall structure that could potentially interfere with flight patterns. (14 CFR 77.9)

This study addresses potential safety risks due to thermal and visible exhaust plumes interfering with aircraft. They conclude the risk is very small.
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Monday, July 11, 2011

Montana SIP Approval (Partial)

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EPA is partially approving and partially disapproving State Implementation Plan (SIP) revisions submitted by the State of Montana on August 26, 1999, May 28, 2003, March 9, 2004, October 25, 2005, and October 16, 2006. The revisions contain new, amended, and repealed rules in Subchapter 7 (Permit, Construction, and Operation of Air Contaminant Sources) that pertain to the issuance of Montana air quality permits, in addition to other minor administrative changes to other subchapters of the Administrative Rules of Montana (ARM).

See FR notice here.
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Wednesday, July 6, 2011

BACT Analysis Resources

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Lake Michigan Air Directors Consortium (LADCO) white papers on control technologies. Appears to be industry-specific technology reviews, from around 2005-2006, in support of SIP preparation for ozone, PM2.5, and regional haze.

Report describing above white papers: background, methodology, program description, etc.

LADCO BART reports. Also appears to be 2005-2006 vintage.

LADCO workshop presentations. See especially the March 24-25, 2010 presentations.

Several control technology presentations from a May 2011 Mid-Atlantic Regional Air Management Assn. (MARAMA) workshop on Advances in Air Pollution Control Technologies.
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Modeling Presentations from 2011 R/S/L Modelers Workshop

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Here's a link to the main page that contains links to the individual presentations.

One thing I found interesting, and potentially useful, was a San Joaquin Valley APCD web page with expanded NO2 modeling guidance and data. For example, they've collected and reported NO2/NOx ratios from a variety of source types. The range of values is surprisingly large.

(Note: Joe attended the single day of this conference that was opened to the public.)
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