SO2 Average Values for 2010-2012 in NC Counties

Sulfur dioxide (SO₂) is monitored in several counties on an intermittent basis that does not provide 3-year or longer term averages. Such averages are available in five counties we present below. In 2012, none of these counties had a three-year average of the 99^th percentile exceeding the daily standard.
 

Table 1. The following table shows 3-year averages for the 99^th percentile of daily maximum SO₂ concentrations. The first column lists the county, the second lists the average value for that county. One county, New Hanover, reached 96 percent of the national ambient standard of 75 PPB. The other counties ranged between only 16 percent to 35 percent of the standard.