Technology Transfer Network / NAAQS
Ozone Implementation
Ozone Monitoring Season By State
Note: EPA no longer updates this information, but it may be useful as a reference or resource.As of July 1, 2000
Since ozone levels decrease significantly in the colder parts of the year
in many areas, ozone is required to be monitored at NAMS and SLAMS monitoring
sites only during the ``ozone season'' as designated in the AIRS files on a
State by State basis and described below:
State Begin month End month
Alabama......................... March............. October.
Alaska.......................... April............. October.
Arizona......................... January........... December.
Arkansas........................ March............. November.
California...................... January........... December.
Colorado........................ March............. September.
Connecticut..................... April............. September.
Delaware........................ April............. October.
District of Columbia............ April............. October.
Florida......................... March............. October.
Georgia......................... March............. October.
Hawaii.......................... January........... December.
Idaho........................... April............. October.
Illinois........................ April............. October.
Indiana......................... April............. September.
Iowa............................ April............. October.
Kansas.......................... April............. October.
Kentucky........................ March............. October.
Louisiana....................... January........... December.
Maine........................... April............. September.
Maryland........................ April............. October.
Massachusetts................... April............. September.
Michigan........................ April............. September.
Minnesota....................... April............. October.
Mississippi..................... March............. October.
Missouri........................ April............. October.
Montana......................... June.............. September.
Nebraska........................ April............. October.
Nevada.......................... January........... December.
New Hampshire................... April............. September.
New Jersey...................... April............. October.
New Mexico...................... January........... December.
New York........................ April............. October.
North Carolina.................. April............. October.
North Dakota.................... May............... September.
Ohio............................ April............. October.
Oklahoma........................ March............. November.
Oregon.......................... May............... September.
Pennsylvania.................... April............. October.
Puerto Rico..................... January........... December.
Rhode Island.................... April............. September.
South Carolina.................. April............. October.
South Dakota.................... June.............. September.
Tennessee....................... March............. October.
Texas AQCR 4,5,7,10,11.......... January........... December
Texas AQCR 1, 2, 3, 6, 8, 9, 12. March............. October
Utah............................ May............... September.
Vermont......................... April............. September.
Virginia........................ April............. October.
Washington...................... May............... September.
West Virginia................... April............. October.
Wisconsin....................... April 15.......... October 15.
Wyoming......................... April............. October.
American Samoa.................. January........... December.
Guam............................ January........... December.
Virgin Islands.................. January........... December.
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