SLIDE 18 11/ 14/ 2013 18
Federal PM 2.5 Standard
A promulgated the current 24-hour PM 2.5 standard at 35 micrograms in 2006, but kept the annual standard at 15.
A finalized a new standard by retaining the 24-hour standard at 35-micrograms, but lowering the annual standard from 15micrograms down to 12 micrograms.
A had also proposed a new secondary standard for visibility in urban areas between 28-30 decibels, but abandoned that concept based upon public comment opposing it.
- All Wisconsin counties currently meet the new 12 microgram PM2.5
standard, but some are very close to the threshold.
2006 PM 2.5 Attainment Redesignation
- Milwaukee County designated as nonattainment for the standard in
2009, and Racine and Waukesha Counties also designated based upon a “significant contribution” to Milwaukee County.
- Good News: Milwaukee County monitors met the 35 µg/ m3 standard
at the end of 2010, and the DNR sent “clean data” to EP A in early 2011.
A still has not finalized the clean data finding for the 2010 data – this should not have been difficult.
A has not acted upon Wisconsin’s PM2.5 redesignation request. 2012 will likely represent the 3rd consecutive year of complying with this standard, yet EP A has not granted relief.