2011’s First Violations of the 1997 Ozone Standard/updated

..occurred at Grapevine (91 ppb) and Denton Airport (95ppb) today. They won’t be the last. Read about how they happened in detail here.

Update at 10pm:

In total, there were four violations today. Beside the two above, there was also Keller   (90) and Pilot Point (87) with Frisco coming in right at 85 ppb. 

You can play at home using this TCEQ website. When one or more monitors gets four or more readings of 86 ppb or above during a single ozone season, that means the DFW air plan is officially failing.