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Data for Air Monitor Sites Meeting the Current Ozone Standard of 0.075 ppm North Carolina vs. HNC 2020 Target, 2009-2011

North Carolina vs. HNC2020 Percentage of Air Monitoring Sites
North Carolina 2007-2009 62.5%
North Carolina 2008-2010 84.6%
North Carolina 2009-2011 87.2%
HNC 2020 Target 2007-2009 100.0%
HNC 2020 Target 2008-2010 100.0%
HNC 2020 Target 2009-2011 100.0%

Data Notes

This indicator is derived from data collected by the North Carolina Division of Air Quality (DAQ). Air monitors continuously measure the amount of ozone present in the air during the ozone season, which runs from April through October. Hourly averages are computed, which are then summarized into eight-hour averages when at least 75% of the hourly data is available. If a day has at least 18 (75%) of the possible 24 8-hour averages, the maximum value is identified as a valid daily maximum. In addition, if less than 75% of the 8-hour averages are complete and the daily maximum value is greater than the standard, it will be included as a valid daily maximum. The fourth highest daily maximum 8-hour average is averaged across three years and expressed to 3 decimal places.  The HNC 2020 target, which is the target to be reached by 2020, is repeated in the data table for graphing purposes.

Data Sources

Division of Air Quality, N.C. Department of Environment and Natural Resources  Safe Drinking Water Information System, U.S. Environmental Protection Agency 

Definition

Air monitor sites meeting the current ozone standard of 0.075 ppm

How We Calculated the Rates

Numerator: Number of air monitor sites meeting the current ozone standard of 0.075 PPM
Denominator: Total number of air monitor sites

Date Indicator Content Last Updated: 02/12/2013


State Center for Health Statistics, N.C. Division of Public Health, Telephone: 919-733-4728, Fax: 919-733-8485
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Content updated: Tue, 12 Feb 2013 13:46:50 EST