EPA air quality Articles
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MODELS-3/CMAQ evaluation during high particulate episodes over Eastern North America in summer 1995 and winter 1998
This study presents the results of an evaluation of the US EPA air quality modelling system MODELS 3/CMAQ/MM5 during episodes of high particulate matter over Eastern North America. Modelling results for PM2.5, PM10, secondary aerosols and precursor gases were compared with observed data derived from a number of monitoring networks operated in the USA and Canada during the episodes.Keywords: ...
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U.S. EPA Releases 1-Hour NO2 NAAQS Modeling Guidance
The U.S. EPA Air Quality Modeling Group (AQMG) recently released a new guidance document for NO2 modeling. The document outlines procedures that can be used to calculate the NO2 design values for comparison to the new 1-hour NO2 National Ambient Air Quality Standard (NAAQS). The new 1-hour NO2 standard of 100 ppb goes into effect on April 12, 2010. This 1-hour NO2 standard is based on the ...
By All4 Inc.
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Managing air quality during regulatory changes
This paper discusses the regulatory and technical issues associated with the revisions to the US EPA Guideline on Air Quality Models. The proposed guideline includes the models AERMOD, CALPUFF, and ISC-PRIME, all of which contain significant technical improvements over prior models. Differences in modelling requirements are appearing as regulatory agencies and industries use technically superior ...
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Dispersion Notes: U.S. EPA Proposes Changes to AERMOD and CALPUFF
Last week, BREEZE staff made the trip to U.S. EPA’s offices in North Carolina for their 11th Modeling Conference to get the latest updates on upcoming changes to the AERMOD system, CALPUFF, and other issues. The highlights include: Relief is coming to U.S. AERMOD users dealing with overprediction of concentrations in low wind speed hours: U.S. EPA plans to make the LOWWIND3 and ADJ_U* ...
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EPA shifts PM2.5 PSD permitting policies
On August 12, 2009, EPA created a significant stir in the regulated community when it issued an order that signals a significant shift in how the agency intends particulate matter with a diameter less than 2.5 micrometers (PM2.5) emissions to be regulated under the Prevention of Significant Deterioration (PSD) program. The order specifically applied to petitions filed by environmental groups ...
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Numerical study of some high PM10 level episodes
The study examines the ability of US EPA Models-3 system to reproduce air pollution episodes and to evaluate the role of different processes in the PM10 pattern formation. The case study focuses on three major PM10 episodes, that occurred over Germany in February and March of 2003. The emission input is prepared on the basis of the TNO inventory. The simulated PM10 concentrations are compared ...
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Bulgarian emergency response system for release of hazardous pollutants - brief description and some examples
The present paper demonstrates some results of the system for modelling of toxic air pollution due to possible accidents in industrial sites. The emergency response system is designed to help the relevant authorities in making important decisions, concerning the evacuation of the population in case of toxic air pollution due to accidents in industrial sites. The system is based on the following ...
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Proposed Revisions to the Guideline on Air Quality Models (Appendix W)
On July 14, 2015, the U.S. Environmental Protection Agency’s (U.S. EPA’s) Office of Air Quality Planning and Standards’ (OAQPS) Air Quality Modeling Group provided a pre-Federal Register (FR) publication of the proposed revisions to the Guideline on Air Quality Models (Appendix W to 40 CFR Part 51) (Guideline) on the U.S. EPA’s Support Center for Regulatory Atmospheric ...
By All4 Inc.
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PM2.5 Air Quality Modeling Updates
There has been much activity over the past six (6) months that will impact how air quality modeling analyses will be conducted for Prevention of Significant Deterioration (PSD) permit applications with respect to particulate matter less than 2.5 microns (PM2.5). As the resident air quality modeling expert at ALL4, I thought it was a good time to walk through each of these changes and discuss the ...
By All4 Inc.
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November 2005 - Regulatory Update
The Onyx Environmental Services - Environmental, Health, Safety, and Transportation department is pleased to present the Monthly Regulatory Update. The update contains a brief summary of the proposed and final rules from EPA, OSHA, and DOT published in the Federal Register in the past calendar month. If you have any questions, comments, or suggestions regarding the Monthly Regulatory Updates, ...
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EPA establishes new 1-hour standard for sulfur dioxide
On June 2, 2010, the U.S. EPA established a new 1-hour primary National Ambient Air Quality Standard (NAAQS) for sulfur dioxide (SO2). The new 1-hour standard was set at the level of 75 parts per billion (ppb) calculated as the three-year average of the 99th percentile of the annual distribution of daily maximum 1-hour average concentrations. With the establishment of the new 1-hour SO2 standard, ...
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Modeling Tip: Using Ozone File Editor Tools in BREEZE AERMOD
To model 1-hour and annual concentrations of NO2 for the National Ambient Air Quality Standard (NAAQS), the U.S. EPA has approved a three-tiered approach as detailed in Section 5.2.4 of EPA’s Guideline on Air Quality Models, Appendix W to 40 CFR Part 511 (Appendix W). This approach, as shown below, is recommended to estimate the ambient concentrations of NO2: Tier 1: Assume complete ...
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Regulatory Update for Electric Utilities in 2011
A1.1 Air Quality Regulatory Challenges for Power Generators in 2011 John Kinsman, Senior Director Environment, Edison Electric Institute This presentation will address air quality legislative and regulatory challenges for electric power generators in 2011, focusing upon NAAQS, hazardous air pollutants and greenhouse gases. .A1.2 Clean Air Act Aback Peter Belmonte, Partner, ERM Now that ...
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New NO2 air standards prove technically challenging
On February 9, 2010, the U. S. Environmental Protection Agency (EPA) established a new National Ambient Air Quality Standard (NAAQS) for nitrogen dioxide (NO2). The new NO2 NAAQS is a one-hour standard set at 100 parts per billion (ppb), which is approximately 188 micrograms per cubic meter (μg/m3). Effective on April 12, 2010, the new one-hour standard is intended to protect against peak ...
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States propose attainment designations for the new 1-hour So2 NAAQS
The U.S. EPA revised the primary National Ambient Air Quality Standard (NAAQS) for sulfur dioxide (SO2) on June 2, 2010 by implementing a new 1-hour standard of 75 parts per billion (ppb) (calculated as the three-year average of the 99th percentile of the annual distribution of daily maximum 1-hour average concentrations). Based on an evaluation of the risks posed by acute exposure to SO2, EPA ...
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