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Canadian and United States
3-Year Average of the 4th Highest 8-Hour Ozone Average
Based on 2001 - 2003 Data

Source: Canadian National Air Pollution Surveillance Network and AQS database. Mapping engine is
Map Generator v2.0 created by MCNC Environmental Programs funded by NESCAUM/EPA/MARAMA.
Map provided courtesy of Mr. Tom Dann, Environment Canada.

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