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| Data collected from the late 1980s to 1997 provided a measure of how smog is modified after leaving the pollution zone in industrial USA and Canada. Carbon monoxide (CO), a long-lived marker for anthropogenic pollution, was measured with O3 to help establish source of the O3. O3:CO ratios observed at Sable Island showed strong positive correlations in summer indicating increased levels of anthropogenic pollution in summer. [Figure D. Parrish] | |