11.   Meanwhile, the very high ozone levels that might remove some pollutants would also irritate delicate lung tissues.

12.   Pollution-monitoring equipment around the city has been showing high ozone readings for two weeks now.

13.   The sulfates readily combine with the moisture in summertime air to create haze, usually accompanied by high ozone that makes breathing difficult.

14.   They argue that nitrogen oxide reductions should be targeted at areas of high ozone, but not blanket across the region.

15.   France is also wrestling with what to do about high ozone levels.

16.   Matthias Bergmann of the Ecological Institute in Berlin advocated rigorous driving bans in densely populated areas during periods of high ozone buildup and restrictions on industrial emissions.

17.   In Paris, the second pollution alert in a week was issued Sunday because of the high ozone levels.