Update on upcoming proposed revisions to the pm 2 5 and pm 10 2 5 standards
Sponsored Links
This presentation is the property of its rightful owner.
1 / 13

Update on Upcoming Proposed Revisions to the PM 2.5 and PM 10-2.5 Standards PowerPoint PPT Presentation


  • 77 Views
  • Uploaded on
  • Presentation posted in: General

Update on Upcoming Proposed Revisions to the PM 2.5 and PM 10-2.5 Standards. Colleen McKaughan, EPA Region 9 December 14, 2005. Overview. History and schedule for PM standards PM 2.5 -- current std. and EPA recommendations

Download Presentation

Update on Upcoming Proposed Revisions to the PM 2.5 and PM 10-2.5 Standards

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Update on Upcoming Proposed Revisions to the PM2.5 and PM10-2.5 Standards

Colleen McKaughan, EPA Region 9

December 14, 2005


Overview

  • History and schedule for PM standards

  • PM2.5 -- current std. and EPA recommendations

  • PM10 -- current std. and EPA recommendations for a new PM coarse std.

  • Stakeholder comments

  • Status of Region 9 areas under the PM10 standards

  • Next Steps


History

  • The Clean Air Act requires periodic reviews and updates of air quality standards

  • A 1997 Court decision found PM10 to be a poorly matched indicator for PM10-2.5 particles because it includes PM2.5

  • OAQPS has prepared a Staff Paper with recommendations for new PM fine and PM coarse standards to EPA’s Administrator


Schedule for the new standards

  • July 2005 - EPA’s Staff Paper was finalized

  • Sept 15, 2005 - Clean Air Scientific Advisory Committee (CASAC) provided a final letter to EPA with recommendations

    • The above two documents are available at www.epa.gov/ttn/naaqs/standards/pm/s_pm_index.html

  • Dec. 20, 2005 - consent decree deadline for proposed rule

  • Sept. 27, 2006 - consent decree deadline for final rule


Current PM2.5 Standards

  • 24-hour standard of 65 ug/m3

  • Annual standard of 15 ug/m3


EPA Staff Paper Recommendations for PM2.5 Standard

  • New scientific evidence warrants a more protective standard

  • Strengthen the 24-hour std. to

    25 - 30 ug/m3 and retain the annual std.

    OR

  • Strengthen the 24-hour std. to

    30 - 40 ug/m3 and strengthen annual std. to 12 - 14 ug/m3


Current PM10 Standard

  • In the West, PM10 emissions are dominated by PM10-2.5 particles

  • 24-hour standard of 150 ug/m3

  • Annual standard of 50 ug/m3

  • Applies universally to all PM-10 and smaller-size particles

  • All monitored exceedences factor into the standard except those flagged and concurred as natural or exceptional events under EPA’s Natural Events Policy


Summary of EPA Staff Paper Recommendations for PM10-2.5

  • Scientific evidence less certain than for PM2.5

  • An urban (UPM10-2.5) 24-hour standard

  • No annual standard

  • UPM10-2.5 monitors to be located in areas with populations of 100,000 or more

  • Densely populated communities w/ 500 people/sq. mile are preferred for UPM10-2.5 monitoring locations


Summary of Staff Paper Recommendations for PM10-2.5

  • 98th percentile standard ranging from 50-70 ug/m3

    OR

  • 99th percentile standard ranging from 60-85 ug/m3


Summary of Staff Paper Recommendations for PM10-2.5

  • Urban emphasis based on the following:

    • Toxicity is responsible for adverse health effects from coarse particles rather than size alone

    • PM coarse particles associated with heavily trafficked paved roads and industrial point sources are enriched by toxic contaminants

    • Higher exposures to coarse particles enriched by toxic contaminants generally occur in urban areas


Stakeholder Input

  • EPA held a public teleconference call with CASAC on August 11, 2005

  • Several Region 9 States & Districts have provided adverse comments to EPA regarding exclusion of rural areas

    • CARB, ADEQ, NDEP

    • Great Basin APCD, Clark County DAQEM, Pinal County AQCD, Washoe County AQMD


Areas in CA, NV, and AZ Violating the PM10 Standards(based on ’02-’04 data)

  • 19 areas violating, excluding areas with exceedences likely caused by natural or exceptional events

  • With respect to the recommended UPM10-2.5 standard:

    • 6 areas have population < 100,000

    • Another 5 areas have exceedences that would not be captured under a 98th percentile form of the PM coarse standard

    • Some of the remaining areas have one or more rural-setting monitors violating the standard


Next Steps

  • EPA’s proposed rule is due December 20

    • www.epa.gov/ttn/naaqs/standards/pm/s_pm_ index.html

  • WRAP agencies will have an opportunity to provide written comments during the public comment period

  • We encourage collection of speciation data at both urban and rural PM monitors and research on rural dust toxicity


  • Login