Technology Transfer Network / NAAQS
Ozone Implementation
Ozone Monitoring Season By State
![Information provided for informational purposes only](../gif/epafiles_misc_outdatediconmini.gif)
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.