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Figure 3. Mobile Source Contribution to Smog-Forming Emissions in Counties Recommended for Nonattainment under New EPA Ozone Standards

County State Metropolitan Statistical Area or Micropolitan Statistical Area* Total On-Road Mobile Source Ozone-Precursor Emissions (Tons) Total All Sources Ozone-Precursor Emissions (Tons) Mobile Sources As Percent of Total Ozone-Precursor Emissions
Johnston County NORTH CAROLINA Raleigh-Cary, NC 9,380 16,032 58.5%
Catoosa County GEORGIA Chattanooga, TN-GA 3,893 6,684 58.2%
Parker County TEXAS Dallas-Fort Worth-Arlington, TX 6,869 11,805 58.2%
Barrow County GEORGIA Atlanta-Sandy Springs-Marietta, GA 2,876 5,077 56.7%
Orange County NORTH CAROLINA Durham, NC 7,360 13,010 56.6%
Madison County OHIO Columbus, OH 3,226 5,705 56.5%
Rockwall County TEXAS Dallas-Fort Worth-Arlington, TX 1,889 3,346 56.5%
Livingston County NEW YORK Rochester, NY 4,378 7,782 56.3%
Prince George County VIRGINIA Richmond, VA 2,108 3,750 56.2%
Newton County GEORGIA Atlanta-Sandy Springs-Marietta, GA 5,123 9,152 56.0%
Hendricks County INDIANA Indianapolis, IN 6,247 11,429 54.7%
Spalding County GEORGIA Atlanta-Sandy Springs-Marietta, GA 3,850 7,089 54.3%
Carroll County GEORGIA Atlanta-Sandy Springs-Marietta, GA 6,929 12,757 54.3%
Spotsylvania County VIRGINIA Washington-Arlington-Alexandria, DC-VA-MD 4,777 8,902 53.7%
Pinal County ARIZONA Phoenix-Mesa-Scottsdale, AZ 12,505 23,347 53.6%
Kaufman County TEXAS Dallas-Fort Worth-Arlington, TX 5,167 9,759 52.9%
Cumberland County NORTH CAROLINA Fayetteville, NC 15,950 30,436 52.4%
Franklin County PENNSYLVANIA Chambersburg, PA 7,181 13,726 52.3%
Lapeer County MICHIGAN Detroit-Warren-Livonia, MI 5,788 11,064 52.3%
Gloucester County VIRGINIA Virginia Beach-Norfolk-Newport News, VA-NC 1,865 3,574 52.2%
Petersburg city VIRGINIA Richmond, VA 2,243 4,298 52.2%
Madison County VIRGINIA   847 1,629 52.0%
Clinton County MICHIGAN Lansing-East Lansing, MI 4,223 8,130 51.9%
Johnson County INDIANA Indianapolis, IN 6,629 12,825 51.7%
Boone County INDIANA Indianapolis, IN 3,826 7,430 51.5%
Washington County MARYLAND Hagerstown-Martinsburg, MD-WV 10,483 20,439 51.3%
Alamance County NORTH CAROLINA Burlington, NC 7,426 14,580 50.9%
Johnson County TEXAS Dallas-Fort Worth-Arlington, TX 8,004 15,784 50.7%
Jefferson County TENNESSEE Morristown, TN 3,729 7,412 50.3%
Calhoun County MICHIGAN Battle Creek, MI 8,524 17,009 50.1%
Walton County GEORGIA Atlanta-Sandy Springs-Marietta, GA 3,327 6,710 49.6%
Genesee County MICHIGAN Flint, MI 22,957 46,321 49.6%
Madison County NEW YORK Syracuse, NY 3,590 7,268 49.4%
Van Buren County MICHIGAN Kalamazoo-Portage, MI 4,853 9,836 49.3%
Schoharie County NEW YORK Albany-Schenectady-Troy, NY 1,988 4,058 49.0%
Ontario County NEW YORK Rochester, NY 5,760 11,790 48.9%
Calaveras County CALIFORNIA   2,219 4,588 48.4%
Knox County OHIO Mount Vernon, OH 2,361 4,936 47.8%
Montgomery County TENNESSEE Clarksville, TN-KY 6,556 13,744 47.7%
Sevier County TENNESSEE Sevierville, TN 3,589 7,588 47.3%
Fredericksburg city VIRGINIA Washington-Arlington-Alexandria, DC-VA-MD 1,267 2,681 47.3%
Page County VIRGINIA   1,245 2,685 46.4%
Hamilton County INDIANA Indianapolis, IN 8,752 18,870 46.4%
Genesee County NEW YORK Batavia, NY 3,922 8,515 46.1%
Kalamazoo County MICHIGAN Kalamazoo-Portage, MI 12,141 26,471 45.9%
Randolph County NORTH CAROLINA Greensboro-High Point, NC 7,331 16,202 45.2%
Hancock County INDIANA Indianapolis, IN 3,695 8,179 45.2%
Iredell County NORTH CAROLINA Statesville-Mooresville, NC 9,637 21,406 45.0%
Burke County NORTH CAROLINA Hickory-Morganton-Lenoir, NC 5,545 12,318 45.0%
Berrien County MICHIGAN Niles-Benton Harbor, MI 10,132 22,556 44.9%
Franklin County NORTH CAROLINA Raleigh-Cary, NC 2,204 4,938 44.6%
Eaton County MICHIGAN Lansing-East Lansing, MI 5,694 12,760 44.6%
Bexar County TEXAS San Antonio, TX 57,446 129,792 44.3%
Botetourt County VIRGINIA Roanoke, VA 3,557 8,065 44.1%
Nash County NORTH CAROLINA Rocky Mount, NC 6,022 13,656 44.1%
Madison County INDIANA Anderson, IN 7,848 17,832 44.0%
Anderson County SOUTH CAROLINA Anderson, SC 11,069 25,176 44.0%
Nevada County CALIFORNIA Truckee-Grass Valley, CA 3,586 8,159 44.0%
Frederick County VIRGINIA Winchester, VA-WV 4,386 9,993 43.9%
Clinton County OHIO Wilmington, OH 2,214 5,060 43.8%
Christian County KENTUCKY Clarksville, TN-KY 4,832 11,048 43.7%
Guadalupe County TEXAS San Antonio, TX 5,807 13,340 43.5%
Lenawee County MICHIGAN Adrian, MI 4,508 10,433 43.2%
Blount County TENNESSEE Knoxville, TN 5,818 13,529 43.0%
Caswell County NORTH CAROLINA   1,156 2,692 43.0%
UNION County NORTH CAROLINA Charlotte-Gastonia-Concord, NC-SC 5,522 12,911 42.8%
Jackson County INDIANA Seymour, IN 3,463 8,146 42.5%
Fairfield County OHIO Columbus, OH 5,199 12,229 42.5%
Centre County PENNSYLVANIA State College, PA 6,560 15,599 42.1%
Spartanburg County SOUTH CAROLINA Spartanburg, SC 17,759 42,934 41.4%
Cayuga County NEW YORK Auburn, NY 3,989 9,908 40.3%
Ingham County MICHIGAN Lansing-East Lansing, MI 13,329 33,328 40.0%
Oswego County NEW YORK Syracuse, NY 6,782 16,970 40.0%
Tuolumne County CALIFORNIA Phoenix Lake-Cedar Ridge, CA 2,720 6,808 40.0%
Lincoln County NORTH CAROLINA Lincolnton, NC 2,965 7,433 39.9%
Greene County INDIANA Bloomington, IN 1,976 4,999 39.5%
Allen County INDIANA Fort Wayne, IN 16,769 42,434 39.5%
Columbiana County OHIO East Liverpool-Salem, OH 4,601 11,702 39.3%
Roanoke County VIRGINIA Roanoke, VA 3,361 8,622 39.0%
Lexington County SOUTH CAROLINA Columbia, SC 12,686 32,664 38.8%
Allegan County MICHIGAN Allegan, MI 6,538 17,070 38.3%
Monroe County NEW YORK Rochester, NY 31,480 83,770 37.6%
Morgan County INDIANA Indianapolis, IN 4,571 12,507 36.5%
Cass County MICHIGAN South Bend-Mishawaka, IN-MI 1,823 5,062 36.0%
Rowan County NORTH CAROLINA Salisbury, NC 8,161 23,000 35.5%
Tioga County PENNSYLVANIA   1,627 4,683 34.7%
Amador County CALIFORNIA   2,048 5,911 34.7%
Jefferson County WEST VIRGINIA Washington-Arlington-Alexandria, DC-VA-MD 1,736 5,022 34.6%
York County SOUTH CAROLINA Charlotte-Gastonia-Concord, NC-SC 9,252 27,265 33.9%
Mariposa County CALIFORNIA   971 2,887 33.6%
Richland County SOUTH CAROLINA Columbia, SC 15,777 47,411 33.3%
Loudon County TENNESSEE Knoxville, TN 3,723 11,236 33.1%
Clearfield County PENNSYLVANIA DuBois, PA 5,427 16,558 32.8%
Comal County TEXAS San Antonio, TX 3,988 12,385 32.2%
Belmont County OHIO Wheeling, WV-OH 5,341 17,245 31.0%
Meigs County TENNESSEE   539 1,756 30.7%
Shelby County INDIANA Indianapolis, IN 3,259 10,819 30.1%
Chautauqua County NEW YORK Jamestown-Dunkirk-Fredonia, NY 8,075 26,878 30.0%
Ellis County TEXAS Dallas-Fort Worth-Arlington, TX 8,283 29,269 28.3%
Wayne County NEW YORK Rochester, NY 4,554 16,099 28.3%
Edgecombe County NORTH CAROLINA Rocky Mount, NC 2,710 9,635 28.1%
Orleans County NEW YORK Rochester, NY 1,987 7,216 27.5%
Alexander County NORTH CAROLINA Hickory-Morganton-Lenoir, NC 1,158 4,299 26.9%
Allen County OHIO Lima, OH 5,798 22,511 25.8%
LaPorte County INDIANA Michigan City-La Porte, IN 7,774 30,648 25.4%
Caldwell County NORTH CAROLINA Hickory-Morganton-Lenoir, NC 3,673 14,649 25.1%
Crittenden County ARKANSAS Memphis, TN-MS-AR 3,828 15,390 24.9%
Mason County MICHIGAN   1,297 5,385 24.1%
Benzie County MICHIGAN Traverse City, MI 820 3,552 23.1%
Rockingham County NORTH CAROLINA Greensboro-High Point, NC 4,571 20,994 21.8%
Chatham County NORTH CAROLINA Durham, NC 2,178 10,555 20.6%
Huron County MICHIGAN   1,720 8,578 20.0%
Isle of Wight County VIRGINIA Virginia Beach-Norfolk-Newport News, VA-NC 1,639 8,549 19.2%
Miami County KANSAS Kansas City, MO-KS 1,365 8,196 16.7%
Anderson County TENNESSEE Knoxville, TN 4,358 28,346 15.4%
Winchester City VIRGINIA Winchester, VA-WV 395 2,589 15.3%
Bartow County GEORGIA Atlanta-Sandy Springs-Marietta, GA 6,464 49,048 13.2%
Warrick County INDIANA Evansville, IN-KY 4,194 33,666 12.5%
Hawkins County TENNESSEE Kingsport-Bristol, TN-VA 2,412 21,577 11.2%
Dearborn County INDIANA Cincinnati-Middletown, OH-KY-IN 3,107 34,869 8.9%
Washington County OHIO Parkersburg-Marietta, WV-OH 3,719 42,292 8.8%
Greene County PENNSYLVANIA   2,892 34,586 8.4%
Monroe County GEORGIA Macon, GA 2,983 36,257 8.2%
Indiana County PENNSYLVANIA Indiana, PA 3,641 57,230 6.4%
Person County NORTH CAROLINA Durham, NC 1,672 39,649 4.2%
Linn County KANSAS Kansas City, MO-KS 708 28,544 2.5%

*Metropolitan Statistical Areas as defined by the Office of Management and Budget in OMB Bulletin 04-03, published in December 2003.