Air Quality Dispersion Modeling (AQDM) | What's new

2018

Meteorological Site Selection Tool now available

To aid in meteorological site selection, the MPCA has created a free online meteorological site selection tool (MSST). This tool was created to produce an objective analysis of the meteorological representativeness measures discussed in MPCA’s Modeling Practices Manual.  In particular, the MSST analyzes proximity, terrain, surface characteristics, urban vs. rural and snow cover to determine meteorological similarity between a selected facility and surrounding meteorological sites. The MSST is currently in the beta stage of development, so facilities are encouraged to run, evaluate and provide feedback on the usefulness of the tool. If a user disagrees with the site selected by the MSST, a different site can be selected using the justification provided by the tool. See the meteorological-data page for more details and a link to the MSST.

 

2017

Updated Air Quality Dispersion Modeling Practices Manual and AQDM forms now available

The 2017 revised MPCA Air Quality Dispersion Modeling Practices Manual (Manual) is now available on the MPCA’s Air Quality Dispersion Modeling working practices and policies webpage. The Manual content is effective as of October 2017 and reflects updates to current modeling practices based on feedback received on the copy of proposed changes, changes to EPA’s Appendix W, and the full transition to MPCA’s e-Service online delivery system. Also available are updated Air Quality Dispersion (AQDM) modeling forms, which are located on the AQDM Forms webpage.

Thank you to everyone who provided input on our proposed 2017 Manual changes! Comments received help improve MPCA’s practice of modeling and review processes. If you ever have thoughts, comments, or related feedback throughout the year, please send us a message at AirModeling.PCA@state.mn.us.

NEW combined air modeling e-Service Training, and Annual MPCA Air Modeling meeting invitation

The process for submitting air dispersion modeling protocols to the MPCA will soon change to an e-Services online delivery system. To introduce this process we have combined a morning training event for external parties with our afternoon Annual Summer MPCA Air Modeling meeting! The air modeling e-Services training will be held from 9:00 a.m. – 12:00 p.m. on Tuesday, July 12, 2016 in the Board Room of the MPCA office in Saint Paul. The training is limited to 30 participants so please RSVP via email at AirModeling.PCA@state.mn.us.

The e-Service is expected to go live either this summer or early next fall. MPCA will allow for a transition period of 60 days from the go-live date before requesting all protocol submittals through e-Services; please see the “Transition from AQDM-01 to e-Services” note on the this webpage for further information. Additional resources will be made available for those unable to attend the in-person training.

The MPCA modeling team will be hosting the Annual MPCA Air Modeling meeting Tuesday July 12, 2016 from 1:00 p.m. – 4:30 p.m. in the MPCA Saint Paul Board Room. Topics include proposed revisions to the Manual, regulatory updates and related Appendix W discussions as well as a special presentation by Greg Pratt, PhD. Please RSVP via email at AirModeling.PCA@state.mn.us and note if you plan to attend both the morning training and afternoon meeting. We look forward to seeing you!

Air quality modeling requests for use of Adj_U* (Adjusted Surface Friction Velocity) as an alternative refined modeling demonstration: Preferred MPCA practices and procedures (March 21, 2016)

The Minnesota Pollution Control Agency (MPCA) is aware of the interest in using an adjusted surface friction velocity (ADJ_U*) in regulatory dispersion modeling demonstrations. At this time, the ADJ_U* approach has not been approved by the U.S. Environmental Protection Agency (EPA) for use as a regulatory modeling default. Approval to use ADJ_U* will continue to be made on a case-by-case basis unless the status of ADJ_U* changes to a default option.

In order to accommodate requests to use the ADJ_U* approach, the MPCA is following the existing EPA Appendix W guidance to provide for consistent and timely review and approval. The MPCA is following the Guideline Criteria for Alternative Models (Section 3.2.2(b) through (e)) and the specific Request for Approval under Section 3.2.2(b)(2) and 3.2.2(d) of the current Appendix W.  

If you anticipate using the ADJ_U* approach, please contact the MPCA Risk Evaluation and Air Modeling Unit Supervisor, Ruth Roberson, at (651) 757-2672 or ruth.roberson@state.mn.us to discuss your proposal further. You may provide your request to use ADJ_U* either prior to submitting an air quality modeling protocol or along with it. Be aware that requesting the use of ADJ_U* will require additional MPCA review time. Contacting MPCA early in the modeling protocol development process is suggested as it provides project proposers an opportunity to familiarize agency staff with project details, identify specific data and agree on analytical expectations needed to support the request, review and approval.

Air Quality Dispersion Modeling Winter Meeting — Thursday, Jan. 14, 2016, 12:30 p.m. to 4:15 p.m.

  • Hiway Federal Credit Union Administration Building
    840 Westminster Street, Saint Paul, Minn.

Proposed NAAQS Modeling Strategy for Title V available for review (07/08/2015)

Review and comment on the proposed National Ambient Air Quality Standards Modeling Strategy for Title V. Comments are due at close of business on October 15.

Draft Update to MPCA Air Dispersion Modeling Guidance is now available; Annual MPCA Air Modeling Guidance meeting invite (06/18/2015)

The MPCA is providing the opportunity for you to review and comment on the proposed changes to the 2015 version of the MPCA Air Quality Modeling Guidance. The proposed 2015 revision can be found on the Air Quality Dispersion Modeling guidance, policies and practices webpage.

You may provide comments on the proposed revisions to the MPCA Air Quality Modeling unit via email at AirModeling.PCA@state.mn.us. The MPCA will accept comments on the proposed revisions until the close of business on August 5, 2015. Please feel free to contact the MPCA Modeling Unit if you have any questions about the proposed revisions.

The MPCA modeling unit will be hosting the Annual MPCA Air Modeling Guidance meeting on Tuesday July 14, 2015. The meeting will take place at the Hiway Federal Credit Union Administration Building in Saint Paul, MN from 1:00pm – 4:00pm.

If you are interested in attending the meeting, please RSVP via email at AirModeling.PCA@state.mn.us

Meteorological files processed with AERMET version 14134 are now available (06/18/2015)

Meteorological data processed with AERMET version 14134, as well as AERMINUTE version 14337 and AERSURFACE version 13016, are now available. The data sets are for the 5-year period of 2009 – 2013. For more information and to access the data, please go to the Meteorological Data webpage.

Proposed NAAQS Modeling Strategy for Title V document available for review (07/08/2015)

The MPCA is providing the opportunity for you to review and comment on the draft document “Proposed National Ambient Air Quality Standards Modeling Strategy”. The draft document can be found on the Air Quality Dispersion Modeling guidance, policies and practices webpage, under the header “Guidance for air quality dispersion modeling”. 

You may provide comments on the draft document to the MPCA Air Quality Modeling unit via email at AirModeling.PCA@state.mn.us. The MPCA will accept comments on the draft document until the close of business on August 5, 2015. Please feel free to contact the MPCA Modeling Unit if you have any questions about the proposed revisions.

Air Dispersion Modeling Seminar to be held on January 13, 2015 (December 1, 2014)

The Minnesota Pollution Control Agency (MPCA) will be holding its annual Winter Air Dispersion Modeling Seminar on Tuesday, January 13, 2015, from 1:00pm to 4:30pm, at the Saint Paul office located at 520 Lafayette Avenue North. The event will be held in rooms 6-1 and 6-2.

As a seminar, the MPCA is seeking topics and presentations from interested parties. If you are interested in attending or presenting a topic or idea, please let us know by Monday, January 5th, 2015. Please send RSVP’s and interests in presenting via email at AirModeling.PCA@state.mn.us. The MPCA will be providing a number of project and air policy-related updates along with the topics of interest submitted by attendees. An agenda will be completed prior to the Seminar and sent to attendees who have RSVP’d. Students are encouraged to attend. There is no charge for this event. We look forward to seeing you in January!

New subpage for Modeling-related Data (November 3, 2014)

A new subpage has been created for modeling-related data, which includes the Class II PSD minor source baseline date (which will be moved from its previous location on our main page), background concentrations, and ozone data for Tier 3 NO2 analyses (OLM and PVMRM). Please see “Air Quality Dispersion Modeling (AQDM) Data” subpage for more information.

Presentation from MPCA’s internal air quality program training, “Modeling for Managers” is now available (November 3, 2014)

A presentation entitled “Modeling for Managers”, from the MPCA’s internal air quality program training on May 1, 2014, is now available. The presentations can be accessed on our “Air Quality Dispersion Modeling (AQDM) Presentations by Air Modeling Staff” subpage. Geared for air quality professionals not familiar with air dispersion modeling, this presentation aims to provide the basics of what goes into a modeling analysis as well as what programs we work with.

2014 MPCA Air Dispersion Modeling Guidance is now available (August 20, 2014)

The 2014 revised MPCA Air Dispersion Modeling Guidance document is now available on the MPCA’s “Air Quality Dispersion Modeling (AQDM) Guidance, Policies, and Practices” subpage. The content of the guidance is effective as of August 2014 and reflects updates to current modeling practices pertaining to the review of non-standard modeling practices, equivalent or better dispersion modeling demonstration, and an approach for selecting a representative ambient air quality monitoring location for the purpose of developing an ambient air quality background concentration.

Thank you to everyone who provided comments on our 2014 guidance – your comments helps us improve our products. If you have additional comments throughout the year, please send us a message at AirModeling.PCA@state.mn.us.

Meteorological files processed with AERMET version 12345 are now available (August 29, 2014)

Meteorological data processed with AERMET version 12345, as well as AERMINUTE version 11325 and AERSURFACE version 13016, are now available. The data sets are for the 5-year period of 2006 – 2010, which is the same as the previous update for AERMET version 11059. For more information and to access the data, please go to the “Meteorological Data” subpage.

Presentations from the Second Annual MPCA Air Modeling Guidance meeting are now available (August 19, 2014)

Presentations from the Second Annual MPCA Air Modeling Guidance meeting on July 1, 2014, are now available. The presentations can be accessed on our “Air Quality Dispersion Modeling (AQDM) Presentations by Air Modeling Staff” subpage. Thank you to all of those who attended the meeting!

Dennis Becker is retiring! (August 19, 2014)

Long-time MPCA employee and air dispersion modeler, Dennis Becker, is moving on to greener pastures!  Dennis’ last day at the MPCA will be September 3, 2014, after 36 years of state service. Thank you, Dennis, for all of your hard work and vision over the years. The air dispersion modeling community will miss you!  Best of luck!

Draft Update to MPCA Air Dispersion Modeling Guidance is now available; Second Annual MPCA Air Modeling Guidance meeting invite (June 19, 2014)

The MPCA is providing the opportunity for you to review and comment on the proposed changes to the 2014 version of the MPCA Air Quality Modeling Guidance. The proposed changes reflect updates to current modeling practices pertaining to the review of non-standard modeling practices, equivalent or better dispersion modeling demonstration, and an approach for selecting a representative ambient air quality monitoring location for the purpose of developing an ambient air quality background concentration. The proposed 2014 revisions can be found here:

 

You may provide comments to the MPCA Air Quality Modeling unit via email at AirModeling.PCA@state.mn.us.  The MPCA will accept comments on the proposed revisions until the close of business on Friday, July 11, 2014. Please feel free to contact the MPCA Modeling Unit if you have any questions about the proposed revisions.

The MPCA modeling unit will be hosting the Second Annual MPCA Air Modeling Guidance meeting on Tuesday July 1, 2014. The meeting will start at 1:00pm in Training Room 2 of the lower level of the MPCA’s Saint Paul offices. If you are interested in attending meeting, please email us at AirModeling.PCA@state.mn.us.  An agenda will be emailed out shortly.

Equivalent or Better Dispersion (EBD) Forms and Guidance Available (Dec. 20, 2013)

The Equivalent or Better Dispersion (EBD) modeling demonstration forms and guidance are now available on our subpages. Please see our “Air Quality Dispersion Modeling (AQDM) Forms” subpage for the new forms, and the “Air Quality Dispersion Modeling (AQDM) Guidance, Policies, and Practices” subpage for the related memorandum and technical guidance for the EBD demonstration.

New subpage for Modeling-related Tools (Dec. 20, 2013)

A new subpage has been created for modeling-related tools, which includes the GIS Nearby Source Tool, the MN Lookup Table, and DISPERSE (which will be moved from its previous location on our pages). Please see “Air Quality Dispersion Modeling (AQDM) Tools” subpage for more information. 

New subpage for Modeling-related Links (July 10, 2013)

The additional resources section within this page have now been moved to the new subpage “Air Quality Dispersion Modeling (AQDM) – Links to related sites.” The subpage now includes the related links from the “Meteorological Data” section. 

Revised AQDM Forms Now Available (July 10, 2013)

Revised versions of the MPCA AQDM forms are now available on the MPCA’s new subpage, “Air Quality Dispersion Modeling (AQDM) Forms.” The revised forms incorporate the updated MPCA Air Dispersion Modeling Guidance, as well as comments from external users. 

All of the MPCA air modeling forms have been moved to this new subpage, and will no longer be available within the “What’s New?” subsection of this page. 

Revised Guidance Now Available (July 3, 2013)

The revised MPCA Air Dispersion Modeling Guidance document is now available on the MPCA’s new subpage, “Air Quality Dispersion Modeling (AQDM) Guidance, Policies, and Practices.”    The content of the guidance is effective as of July 3, 2013 and defines the working practices and expectations of all air quality modeling demonstrations.

The MPCA modeling-related policies have also been moved to this new subpage as well, and will no longer be available within the “What’s New?” subsection of this page. 

Seminar for Air Dispersion Modeling Guidance to be held on July 16, 2013 (posted July 2, 2013)

A seminar session on the updated air dispersion modeling guidance will be held at the MPCA St. Paul Office in Training Room 2 on Tuesday July 16, 2013 from 9:30 am to 12:00 pm.

The focus of this seminar will be on the updated guidance document, examples relating to how to model regarding nearby sources and background concentrations, as well as updated forms and webpages.

To RSVP to the Modeling Guidance Seminar, and to receive an agenda, please send a request to the MPCA Air Quality Modeling Unit email at airmodeling.pca@state.mn.us. Please RSVP no later than Monday July 15, 2013 by noon.

Update to "Data for AERMOD Applications" subpage (February 2, 2012)

The "Data for AERMOD Applications" subpage has been revised and is now the "Meteorological Data" subpage. As part of this revision, files processed with AERMET versions 04300 and 06341, as well as Digital Elevation Model (DEM) data for AERMAP, have been removed and are no longer available through our modeling Web pages.

Meteorological data processed with AERMET version 11059, as well as AERMINUTE version 11059 and AERSURFACE version 08009, are now available on this updated subpage. The data sets are for the 5-year period of 2006 – 2010. For more information and to access the data, please go to the "Meteorological Data" subpage.

Draft MPCA Air Dispersion Modeling Guidance and Informational Session (November 9, 2012)

An informational session on the draft guidance will be held on Tuesday December 11, 2012, at the MPCA’s St. Paul office in Meeting Room #6-2 from 1:00pm – 4:00pm CST. Those wishing to attend the information session should RSVP by Friday December 7, 2012 via the MPCA air quality modeling unit email address at airmodeling.pca@state.mn.us.

A detailed agenda for the informational session will be made available around Tuesday December 4, 2012.

Update to “Data for AERMOD Applications” subpage (March 6, 2012)

The “Data for AERMOD Applications” subpage has been revised and is now the “Meteorological Data” subpage. As part of this revision, files processed with AERMET versions 04300 and 06341, as well as Digital Elevation Model (DEM) data for AERMAP, have been removed and are no longer available through our modeling Web pages. 

Meteorological data processed with AERMET version 11059, as well as AERMINUTE version 11059 and AERSURFACE version 08009, are now available on this updated subpage. The data sets are for the 5-year period of 2006 – 2010. For more information and to access the data, please go to the “Meteorological Data” subpage.

Removal of ISC-Type Meteorological Data (November 17, 2011)

The "Air Dispersion Modeling Data: Meteorological Data for ISC-Type Models" page and subsequent PCRAMMET version 99169 processed meteorological data are no longer available through our modeling Web pages. Contact the appropriate MPCA modeling staff member for special-request meteorological data.

New Requirement: Air Dispersion Modeling Protocol Forms (September 27, 2011)

Permit applicants required to conduct air dispersion modeling should complete and submit the Air Quality Dispersion Modeling Protocol form (AQDM-01) and the Air Quality Dispersion Modeling Protocol Spreadsheet (AQDM-02) along with accompanying files to the MPCA. Applicants should receive MPCA approval of the AQDM-01 and AQDM-02 prior to submitting the Air Quality Dispersion Modeling Report (AQDM-06) with the permit application.

For more information and to access the Modeling Protocol and Modeling Report forms, please go to the Air Quality Dispersion Modeling (AQDM) Forms subpage.

Modeling Policy Documents (September 27, 2011)

For more information and to access the Modeling Policy Documents, please go to the Air Quality Dispersion Modeling (AQDM) Guidance, Policies, and Practices subpage.