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Indicators: AirClearing the AirThe total amount of pollution in Connecticut’ s air has improved gradually over two decades.
Six air pollutants -- sulfur dioxide, lead, carbon monoxide, particulates, nitrogen dioxide, and ground-level ozone -- are measured across the state by the DEP. At the end of every year, the Council expresses the average level of each pollutant on a numerical scale, where zero equals no pollution and 100 represents the “unhealthful” level of the specified pollutant. The Council then takes this annual number for each of the six pollutants and averages them to yield the single index value on this graph. Levels of lead in the air have dropped so low that they barely register in this indicator. Following several years of measurable improvement, 2005 was the first year since 1994 to see all of the pollutants (excluding lead) get worse. In 2006, all pollutants except particulates showed improvement. | |
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