2006-09-21: New EPA PM2.5 Standards

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On Sep 21 EPA announced the new PM satandards:

• Daily PM2.5 98th percentile in a year, averaged over three years <35 µg/m3. Same form as the current daily standard except reduced from 65 to 35 µg/m3.

• Annual PM2.5 - three-year average of the annual average PM2.5 is <15 µg/m3. Same as the current annual standard.

• Daily PM10 - 24-hour PM10 does not exceeded 150µg/m3 more than once per year on average over a three years. Same as the current 24-hour standard.

The daily PM2.5 standard of 35 ug/m3 (98%-ile) is of particular interest since (1) its attainmnet will be violated over larger regions and (2) the role of extra-jurisdictional exceptional events will play more significanr role. During Jul-Dec 2005 the CAPITA group was actively supporting EPA in developing the Exceptional Event Rule through a Exceptional_Events Project.

This is the beginning of a new CAPITA project to support the

A new With the announcement of the new standard, working and the DataFed federation has been supportive