EPA Officially Announces AerScreen Preferred Screening Model

AerScreen EPA Memo

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October 2010 Biomass Modeling Report from RTP

This is a useful report that, among other things, provides data for in-stack ratios of NO/NO2 from wood combustion. Diane Lorenzen provided it to MDEQ to support assumptions she made in the UM boiler modeling.

Biomass Modeling Report
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BACT Resources

Clean Air Technology Center
Lots of fact sheets for various control technologies. Includes typical control efficiency ranges and very rough cost estimates.

Environmental Technology Verification Program, Air Pollution Control Technology Center
Generally more current than the CATC, but far fewer resoucrces.

Historical Chemical Engineering Plant Cost Indices
CEPCI for 1950 through 2006

Equipment cost scaling factors
Includes X^0.6 rule for scaling known price of equipment at size A to unknown price of similar equipment at size B.

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Nuclear Energy Pro and Con

Two interesting articles from the Chemical Engineering magazine evaluating nuclear energy--one for and one against. Especially interesting now that we've seen demonstrated some of the risks.

Nuclear Energy: A Vital Component of Our Energy Future

Nuclear Renaissance: A Flawed Proposition

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Libby, Columbia Falls PM10 and PM2.5 SIPs

PM10 SIP: CF and Libby

PM2.5 SIP: Libby
Final EPA acceptance published 3/17/2011

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Proposed Utility MACT

Link to EPA site with proposed rule, fact sheets, and presentation (click on title).

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Updated NO2/SO2 1-hr modeling guidance

EPA released additional guidance for modeling 1-hour NO2 NAAQS compliance 3/1/2011. It updates OLM and PVMRM policy, addresses significant contribution analyses using the SILs, and discusses how to perform cumulative analyses including the option of incorporating temporally-varying background concentrations.

It also "[r]ecommends that compliance demonstrations for the 1-hour NO2 NAAQS address emission scenarios that can logically be assumed to be relatively continuous or which occur frequently enough to contribute significantly to the annual distribution of daily maximum 1-hour concentrations based on existing modeling guidelines, which provide sufficient discretion for reviewing authorities to not include intermittent emissions from emergency generators or startup/shutdown operations from compliance demonstrations for the 1-hour NO2 standard under appropriate circumstances."

3/1/2011 Policy Memo

See this blog post for access to previous memos.

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See this article for a helpful discussion of the state of SO2 and NO2 1-hr NAAQS modeling guidance, including April updates to AERMOD and AERMET. It also talks about recent EPA guidance to states for 1-hr SO2 NAAQS attainment designation.
(added 5/20/2011, KMM)
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