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NC Air Quality Trends <br /> <br />120- <br />80- <br /> <br />20- <br />O' <br /> <br />Source NC OENR'$ DAQ '~earlng the .Nr" <br /> <br />This graph shows long-term trends for air pollutants in North Carolina, with levels declining <br />for lead, larger particulates, carbon monoxide, nitrogen dioxide and sulfur dioxide. The <br />exception to this trend is ozone, which declined from the late 1980s to mid-1990s, but has <br />gone up in recent years. The state has a plan in place to come into attainment with the ozone <br />standard. <br /> <br /> <br />