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Complete Indicator Profile of Ozone Standard Met


Air monitor sites meeting the current ozone standard of 0.075 ppm


Number of air monitor sites meeting the current ozone standard of 0.075 PPM


Total number of air monitor sites

Data Interpretation Issues

The Division of Air Quality, along with three local program agencies and one tribal agency, collects air samples for the state?s "Ambient Air Criteria Pollutant Monitoring Program" from 40 sites across the state, representing over 30 counties. The statewide value represents only those 30 counties, so the complete statewide value is unknown.

Why Is This Important?

"People with asthma are especially sensitive to ozone exposure. Ozone has been linked to increased frequency of asthma attacks and use of health care services. Ozone exposure may also affect respiratory system development in very young children." - North Carolina Institute of Medicine. Healthy North Carolina 2020: A Better State of Health.

Other Objectives

Healthy North Carolina 2020

Graphical Data Views

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

::chart - missing::

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 

Page Content Updated On 02/12/2013, Published on 02/12/2013
State Center for Health Statistics, N.C. Division of Public Health, Telephone: 919-733-4728, Fax: 919-733-8485
North Carolina - A better place to be.
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Content updated: Tue, 12 Feb 2013 13:46:50 EST