Tag Archives: “Clean Air Scientific Advisory Committee”

What Happens When the EPA Technical Staff Disagrees with the Clean Air Science Advisory Committee?

Last week, the EPA Clean Air Science Advisory Committee provided EPA its review of EPA’s Policy Assessment for the Reconsideration of the National Ambient Air Quality Standard for ozone.  As expected, CASAC has disagreed with the recommendation of EPA technical staff to retain the current 70 ppb standard.  Instead, CASAC recommends a significantly lower ozone NAAQS of 55-60 ppb. 

This seems to be coming down to a fight between EPA’s reliance on controlled human exposure (CHE) studies and CASAC’s position that EPA is giving too little weight to epidemiological studies,… More

Deja Vu One More Time? What Will Happen If EPA Ignores CASAC Regarding the Ozone NAAQS?

Last week, Inside EPA (subscription required) reported that the Clean Air Science Advisory Committee has pretty much agreed that the National Ambient Air Quality Standards for ozone must be made more stringent.  Apparently, the panel is looking at recommending that the primary standard be reduced from 70 ppb to a range of 55-60 ppb.  CASAC is also recommending a reduction in the secondary standard. 

I’ve blogged numerous times about the role that CASAC recommendations play in judicial review of EPA’s decisions concerning setting the NAAQS. … More

PM2.5 Emissions From Wildfires — No Longer So Exceptional!

Last week, the Clean Air Scientific Advisory Committee formally transmitted its recommendations to EPA Administrator Regan regarding the PM2.5 NAAQS.  Consistent with trade press reporting over the past few months, the majority of CASAC members recommended that the PM2.5 NAAQS be set between 8-10 ug/m3.  A minority recommended the range be set between 10-11 ug/m3.  I’d be surprised if the revised NAAQS is set above 10 ug/3. 

For me,… More