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On Public Notice | Proposed for Adoption

On Public Notice

Air Quality Control Region Priority Reclassification Request – Multipollutant

Pursuant to 40 CFR 51 Subpart H, Prevention of Air Pollution Emergency Episodes, this action requests reclassification of several Missouri Air Quality Control Regions to lower priority classifications for carbon monoxide, sulfur dioxide, and particulate matter. The action also increases the priority classification for sulfur dioxide in the Southeast Missouri Intrastate Air Quality Control Region, and requests exemptions for emergency episode contingency plans in portions of regions that are designated attainment for the applicable pollutants. The request is based on the three most recent years (2016-2018) of certified ambient monitoring data.

Air Quality Control Region Priority Reclassification Request – Multipollutant

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A public hearing is scheduled for this action on Dec. 3, 2019. Comments about this action will be accepted through close of business on Dec. 10, 2019.

Proposed for Adoption

Maintenance Plan Revision for the St. Louis (Missouri) Maintenance Area Under the 1979, 1997, and 2008 Ozone Standards

This plan revision replaces the currently approved maintenance plan for the Missouri portion of the St. Louis maintenance area under the 2008 ozone standard. This standard is more stringent than the 1979 and 1997 ozone standards; therefore this revision also replaces the previous maintenance plans under those standards. The revision updates the maintenance demonstration showing that continued implementation of Missouri’s vehicle inspection and maintenance program and federal reformulated gasoline requirements in the area are not necessary for the area to continue to maintain compliance with the 2008 ozone standard.

Maintenance Plan Revision for the St. Louis (Missouri) Maintenance Area Under the 1979, 1997, and 2008 Ozone Standards
Appendices A through D
Summary of Comments and Responses

A public hearing for this plan action was held on Aug. 29, 2019. Comments about the plan action were accepted through close of business on Sept. 5, 2019. Revisions to the plan were made as a result of comments received.

Maintenance Plan Revision for the St. Louis (Missouri) Maintenance Area Under the 1997 Annual Fine Particulate Matter (PM2.5 ) Standard

This plan revision replaces the currently approved maintenance plan for the Missouri portion of the St. Louis maintenance area under the 1997 annual PM2.5 standard. The revision updates the maintenance demonstration showing that continued implementation of Missouri’s vehicle inspection and maintenance program and federal reformulated gasoline requirements in the area are not necessary for the area to continue to maintain compliance with this standard.

Maintenance Plan Revision for the St. Louis (Missouri) Maintenance Area Under the 1997 Annual PM2.5 Standard
Appendices A through E
Summary of Comments and Responses

A public hearing for this plan action was held on Aug. 29, 2019. Comments about the plan action were accepted through close of business on Sept. 13, 2019. Revisions to the plan were made as a result of comments received.

Inspection and Maintenance Program for the St. Louis Area – 2019 Revision

This State Implementation Plan (SIP) revision updates Missouri’s on-road motor vehicle emissions inspection and maintenance (I/M) program in the St. Louis area, also known as the Gateway Vehicle Inspection Program. The revision requests EPA approval to fully remove the I/M program requirements in Franklin and Jefferson counties from Missouri’s SIP. The revision does not remove the I/M program requirements in the City of St. Louis or the counties of St. Louis or St. Charles. The Missouri Department of Natural Resources’ Air Pollution Control Program is evaluating the continued need for the program in these remaining counties with respect to the 2015 ozone standard, for which these counties are currently designated nonattainment. The revision also includes several updates to reflect current operations of the program.

Inspection and Maintenance Program for the St. Louis Area – 2019 Revision
Appendices 1 through 9
Summary of Comments and Responses

A public hearing for this plan action was held on Aug. 29, 2019. Comments about the plan action were accepted through close of business on Sept. 5, 2019. No revisions to the plan were made as a result of comments received.

These three plans will be presented to the Missouri Air Conservation Commission for adoption on Oct. 31, 2019. The plans and appendices are listed above along with a summary of the comments received and the corresponding responses from the Department. A copy of all the written comments received during the public comment periods for these three plan actions are listed below.

Comments Received