SUN-12-2009 09:16 US EPA

JAMES H. DOUGLAS

GOVERNOR

State of Vermont 

### OFFICE OF THE GOVERNOR June 4, 2009
Mr. Ira W. Leighton 

### Acting Regional Administrator EPA New England, Region 1 I Congress Street Suite I100 Boston, MA 02114-2023 617 918 1505 P.01



### Re: VERMONT DESIGNATIONS FOR THE 2008 REVISED OZONE NATIONAL AMBIENT AIR QUALITY STANDARDS Dear Mr. Leighton: In accordance with the requirements of the Clean Air Act (CAA) pertaining to area designations for the 2008 revised ozone National Ambient Air Quality Standards (NAAQS), we are pleased to recommend that the State of Vermont be designated as 'attainment/unclassifiable for the both the primary and secondary ozone NAAQS. This fulfills our obligation to identify areas in Vermont that have ozone concentrations above the Environmental Protection Agency's (EPA) 8-hour primary and secondary standards which were promulgated on March 12, 2008. The State of Vermont has used ozone data from for 2005-2007 from sites located in Bennington and Chittenden counties, in the towns of Bennington and Underhill, respectively

. These monitoring locations effectively span the state in a north/south direction

. The attached tables summarize the data and show that both ofthese monitoring locations currently attain the 8-hour ozone primary and secondary NAAQS. Regional concentration patterns for monitored ozone lend support to our beliefthat all other counties in Vermont similarly meet the ozone standards. In addition, I would like to reemphasize that Vermont's attainment status is precarious given ozone's regionally episodic nature and the proven transport of ozone precursors from regions upwind regions. We strongly believe that maintenance of our attainment status depends on the equitable implementation of control measures on sources of ozone-forming precursor emissions in the eastern half of the US. Vermont is committed to working with states in the Ozone Transport Region (OTR) on regional control strategies

. However, evidence is strong that transport of ozone precursors does not stop at the OTR borders. More broadly applicable measures for, at

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.828.3339 •TDD: 802.828.3345SUN-12-2009 09:16 US EPA



### Mr. Ira W. Leighton June 4, 2009 Page 2 617 918 1505 P.02

least the eastern half of the US, are needed to achieve the comprehensive emission reductions, of nitrogen oxides in particular, that will eliminate the current widespread non-attainment of ozone standards and the resulting toll on human health. Sincerely,

cc: David Conroy, Air Programs Branch (EPA Region 1) Anne Arnold, Air Quality Unit (EPA Region l) EnclosuresSUN-12-2009 09:16 US EPA 617 918 1505 P.03

STATE. OF VERMONT AREA DESIGNATIONS UNDER CLEAN AIR ACT (CAA) SECTION 107(D)

PRIMARY AND SECONDARY OZONE N.A.AQS
---------------DESIGNATIONS ----------

POLLUTANT DESIGNATED AREA COTINTY NONATTAINMENT ATTAINMENT/ UNCLASSIFIABLE
8-hour ozone State of Vermont X 8-hourozone Addison X 8-hour ozone Bennington X 8-hour ozone Caledonia X 8-hour ozone Chittenden X 8-hour ozone Essex X 8-hour ozone Frankin X 8-hour ozone Grand Isle X 8-hour ozone Lamoille X 8-hour ozone Orange X 8-hour ozone Orleans X 8-hour ozone Rutland X 8-hour ozone Washington X 8-hourozone Windham X 8-hour ozone Windsor XSUN-12-2009 09:17 US EPA 617 918 1505 P.04

Vermont Primary and Secondary Ozone Compliance Data ----------Bennington

---------- ----------Underhill---------- Annual 4th Annual 4th maximum Truncated 3 maximum Truncated 3 daily year average daily year average maximum of annual 4th maximum of annual 4th Year average maximum (average maximum



### ------------------------- (ppm)4----------------------- 1987 0.083 ii 1988

. 0.102 1989 0.082 0.089 0.070 1990 0.086 0.090 0.072 1991 0.093 0.087 0.080 0.074 1992 0.081 0.086 11 0.086 0.079 1993 6.082 0.085 0.076 0.080 

### 1994 0.081 0.081 0.075 0.079 1995 0.078 0.080 0.074 

### 0.075 1996 0.079 0.079 0.065 

### 0.071 1997 0.082 0.079 

### „0.072 0.070 1998 0.075 0.078 10.073 0.070 1999 0.083 0.080 0.079 0.074 2000 0.071 0.076 0.071 0.074 2001 0.083 0.079 0.076 

### 0.075 2002 0.086 0.080 0.084 0.077 2003 0.073 0.080 0.074 

### 0.078 2004 0.074 

### 0.077 10.071 0.076 

### 2005 0.073 0.073 10.069 0.071 2006 0.068 0.071 10.065 

### 0.068 j 2007 0.077 , 

### 0.077 The 2008 primary and secondary ozone NAAAQS is 0.075 ppm. For the 2008 attainment designation (2005-2007), Vermont is in attainment

for the primary and secondary ozone NAAQS.

TOTAL P.04