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Region 7 Air Program

Serving Iowa, Kansas, Missouri, Nebraska and 9 Tribal Nations

Kansas City Ozone Maintenance Plan - Second Ten-Year Plan

Background of the Plan: The Kansas City area (Johnson and Wyandotte Counties in Kansas and Clay, Jackson and Platte Counties in Missouri) was designated nonattainment with respect to the 1-hour ozone standard in 1978. In 1991 the area was able to demonstrate that it had attained the standard and EPA redesignated the area to attainment in 1992. At the same time, a plan to maintain the 1-hour standard for a period of ten years was approved. This plan was revised in 2002 and it demonstrated once again how the standard will be maintained for a second ten-year period, through 2012.

Summary of the Plan: The plan relies on an emissions budget for volatile organic compounds (VOC) and nitrogen oxides (NOx) to maintain the ozone standard through a combination of control measures. These measures include both stationary and mobile source controls. The state agreed to continue monitoring ambient air quality, to periodically update the emissions inventory to ensure it is consistent with the budget, and to implement certain contingency measures if the standard is violated. The Kansas plan was approved by EPA on January 13, 2004 (See 69 FR 1919).

Emission Reductions: One means of demonstrating continued attainment is to show that emissions during the period of the maintenance plan will not exceed the level of emissions existing at the time of attainment. This revised plan relies on an attainment level of emissions of VOCs and NOx to maintain the ozone standard through a combination of control measures. These measures include stationary, area and mobile source controls. The annual emissions from the area for 1999, a period when no exceedances or violations of the standard occurred, and 2012, the last year of the maintenance plan, are shown in the table below.

Emissions in the Kanas City Maintenance Area

Year  Pollutant Emission (Tons per OSD1
1999 367.35 424.2
2012 335.55 373.4

1 The term ozone summer day is abbreviated as OSD.

As can be seen, the analysis projects decreases in total emissions during the ten-year maintenance period. Thus the plan has demonstrated that the 1-hour ozone standard will be maintained.

Stationary Source Regulations: This plan relies upon continued implementation of regulations that reduce emissions from stationary sources and include the following rules:

Mobile Source Control Measures: Mobile source control measures approved in the plan include the Federal motor vehicle emissions control program and reductions in the volatility of gasoline. In addition, the plan relies upon lower volatility gasoline to control fuel volatility (KAR 28-19-719, Fuel volatility).

This revised plan also revised the motor vehicle emissions budgets. These budgets are used to ensure that transportation plans conform to the SIP. The new, area-wide budgets are shown in the table below:

Area-wide Motor Vehicle Emissions Budget for 2012

Pollutant  Amount (Tons per OSD) 
VOC 64.7
NOx 97.8

These budgets support maintenance of air quality in the Kansas City area and, thus, were found adequate March 17, 2003 (68 FR 33690, June 5, 2003). These new budgets are to be used in all subsequent conformity determinations concerning transportation plans.

Other Features: The current ambient air quality monitoring network consisting of six monitors operating in the Kansas City area is described. Two monitors are located in Liberty and Watkins Mill Park and are considered to be downwind monitors; two are placed in populated areas at Rocky Creek, previously located at the Worlds of Fun, and the Kansas City International Airport; one is placed upwind at Richards Gebaur Airport; and one is located downtown in Kansas City, Kansas. The state did commit to continue monitoring the air quality for the next ten years.

An updated emission inventory was prepared for the Kansas City area for the year 1999. Emissions were then projected for the year 2012. These inventories, as a part of a revised maintenance plan, were submitted by Missouri and Kansas on December 17, 2002, and January 9, 2003, respectively.

Continued maintenance of the ozone standard depends, in part, upon the state's efforts toward tracking air quality and VOC and NOx emissions. The state has committed to updating the emissions inventory for the Kansas portion of the Kansas City maintenance area every three years. This inventory will include point, area, mobile and biogenic emissions sources.

Contingency Measures: As required by the CAA, contingency provisions are provided in the plan. The state committed to reduce the total VOC emissions identified in the combined Johnson and Wyandotte County inventory by five percent in response to a future violation of the ozone standard. Prior to implementation, the Kansas Department of Health and Environment (KDHE) will review the latest applicable emissions inventory data, perform a comprehensive evaluation of control strategies and select those control measures that provide the greatest benefit and most cost-effective response to achieve the needed VOC emission reduction. Control measures to be considered will include but will not be limited to the following measures:

  • Stationary source controls (NOx and VOC), including offsets,
  • Review and evaluation of existing VOC regulations for the Kansas City metropolitan area to identify opportunities for additional reductions through amendment of these regulations as appropriate,
  • Transportation control measures (TCMs) (to the extent that VOC emissions reductions from these TCMs can be accurately defined and confirmed),
  • Stage II vapor recovery, and
  • Enhanced vehicle emissions reduction programs.

Once a violation of the national ambient air quality standard (NAAQS) has been validated, the evaluation of control strategies will be completed within 180 days. Kansas committed to implement any necessary contingency measures within 24 months after a violation of the 1-hour ozone standard.

Additional Information: An implementation rule for the 8-hour ozone standard was proposed on June 2, 2003 (see 68 FR 32802). Part of the proposed rule concerns transition from the 1-hour standard to the 8-hour standard. At the time this document was posted to our website, the 8-hour implementation rule had not been finalized.

EPA Region 7 Contact: Amy Bhesania, (931) 551-7147, bhesania.amy@epa.gov.

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