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Update on Proposed Ozone FRM

Update on Proposed Ozone FRM. Ozone Transport Commission Spring Committee Meeting April 10, 2014 Washington, DC Will Ollison. New O 3 Federal Reference Method. CASAC doubts proposed NO-CL FRM, UV-SL a better choice?

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Update on Proposed Ozone FRM

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  1. Update on Proposed Ozone FRM Ozone Transport Commission Spring Committee Meeting April 10, 2014 Washington, DC Will Ollison 1220 L Street, NW • Washington, DC 20005-4070 • www.api.org

  2. New O3 Federal Reference Method CASAC doubts proposed NO-CL FRM, UV-SL a better choice? • An April 3, 2014 EPA CASAC-AMMS presentation and other recent publications suggest that a scrubberless UV (UV-SL) method is superior to the proposed FRM nitric oxide chemiluminescent (NO-CL) method –http://www.epa.gov/casac • An “absolute” FRM UV methodology complements the current U.S. O3compliance and global NIST/BIPM Standard Reference Photometer networks • Current U.S. O3 network UV photometers can be economically upgraded to FRM status by replacing metal oxide O3 scrubbers with NO scrubbers - http://www.twobtech.com/ 1220 L Street, NW • Washington, DC 20005-4070 • www.api.org

  3. EPA Comparison of NO-CL & UV-SL Methods to FRM NO-CL versus ethylene-CL FRM UV-SL versus ethylene-CL FRM http://www.epa.gov/casac

  4. GPT Scrubberless Module™ Drop-in NO-scrubbers are commercially available to convert Teledyne-API & Thermo O3 photometers to “interference-free” (H2O, Hg, aromatic VOCs) O3 monitors. http://www.twobtech.com/

  5. CASTNet & SLAMS Site O3 Values Need Adjustment A recent O3 network protocol review identifies a number of needed improvements (Leston, 2014 - See 4/3/14 public comment at http://www.epa.gov/casac) • O3 inlet height above grade can high bias O3 values by 3-4 ppb at 10 meter rural/remote CASTNet sites compared to 3-4 meter urban/suburban SLAMS sites • High altitude O3 design values overstate 75 ppb NAAQS stringency, for example by 13 ppb in Denver compared to sea level sites, since residents respond to inhaled O3concentrations, not to pressure-invariant mixing ratios • Use of dry ozonized zero air to assess O3 photometer bias & precision discounts substantial sample matrix interference in current network photometers 1220 L Street, NW • Washington, DC 20005-4070 • www.api.org

  6. Design Value Adjustment for Inhaled O3 Altitude Effect City Altitude & Inhaled O3 Effect NE City, Altitude, & DV Adjustment 1220 L Street, NW • Washington, DC 20005-4070 • www.api.org

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