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Pinedale Online > News > February 2011 > One orange dot in the US = us! > Boulder hits 98 PPB |
Back to Article © Photo by DEQ Boulder Air Quality Monitoring Station |
Boulder one-hour ozone reading hit 98 PPB around 3:30PM on Monday, Feb. 21st. Reading levels steadily dropped after that time as increasing clouds rolled in and covered the sky, going below 75 PPB by 5:30PM. |
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