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Ground level ozone is the ' one pollutant for which the surrounding region has not yet reached the federal health ; standard. Ground level ozone ; levels have been decreasing > over the past decade. And ! there are fewer days when ; unhealthful ozone air quality occurs.
Twelve years ago there were about twelve days a year when this occurred. In recent years, there have been about six such days a year. This trend has been determined to reflect the true underlying direction of improving ozone air quality. The trend is not due only to some favorable change in weather conditions that can also influence ozone levels.
Ozone concentration levels "have gone down between 10 percent and 17 percent during . the past decade. Some of this .• trend is due to actions already taken to reduce emissions from fuels, factories, commercial establishments and auto- tnobiles. Many of the methods adopted in recent years to •’reduce emissions have yet to
93.7%