The American Lung Association this week ranked Harford County among the worst counties in the nation for ozone pollution this week by the American Lung Association, the result of the Interstate 95 corridor and pollutants drifting in from other, more developed areas.

The association?s State of the Air 2007 report ranked Harford as Maryland?s worst and the nation?s 21st-worst county for ozone pollution, with a weighted average of 10.7 days a year of unhealthy amounts of low-lying ozone pollution. The second-worst county in the state was Anne Arundel, which had an average of 7.2 unhealthy days.

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