Update on Proposed Ozone FRM

Ozone Transport Commission Spring Committee Meeting

April 10, 2014Washington, DC

Will Ollison

1220 L Street, NW • Washington, DC 20005-4070 • www.api.org

1

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. O3 compliance 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.org2

EPA Comparison of NO-CL & UV-SL Methods to

FRMNO-CL versus ethylene-CL FRM UV-SL versus ethylene-CL FRM

http://www.epa.gov/casac 3

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/ 4

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 O3 concentrations, 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 5

Design Value Adjustment for Inhaled

O3 Altitude EffectCity Altitude & Inhaled O3 Effect NE City, Altitude, & DV Adjustment

1220 L Street, NW • Washington, DC 20005-4070 • www.api.org

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Altitude Altitude Inhaled O3meters feet Equivalent ppb

0 0 75110 361 76220 722 77340 1115 78460 1509 79580 1903 80700 2297 81830 2723 82960 3150 831090 3576 841220 4003 851350 4429 861490 4888 871630 5348 881770 5807 891920 6299 902070 6791 912220 7283 922370 7776 932530 8301 942690 8825 952850 9350 963020 9908 97

North Eastern Altitude Design Value North Eastern Altitude Design ValueCities Feet Reduction ppb Cities Feet Reduction ppb

Atlantic City, NJ 8 0-1 Burlington, VT 113 0-1Bridgeport, CT 10 0-1 Bangor, ME 158 0-1

Albany, NY 20 0-1 Manchester, NH 175 0-1Boston, MA 20 0-1 Meriden, CT 190 0-1

Portsmouth, NH 21 0-1 Fall River, MA 200 0-1Portland, ME 25 0-1 New Britain, CT 200 0-1

Cambridge, MA 30 0-1 Brattleboro, VT 240 0-1Stamford, CT 35 0-1 Schenectady, NY 245 0-1

Troy, NY 35 0-1 Reading, PA 266 0-1Elizabeth, NJ 38 0-1 Concord, NH 288 0-1

New Haven, CT 40 0-1 Harrisburg, PA 320 0-1Philadelphia, PA 40 0-1 Allentown, PA 350 0-1

Augusta, ME 45 0-1 Lancaster, PA 368 1-2Lawrence, MA 50 0-1 Syracuse, NY 400 1-2

Trenton, NJ 54 0-1 Utica, NY 415 1-2New York, NY 55 0-1 Worcester, MA 480 1-2Paterson, NJ 70 0-1 Rochester, NY 515 1-2

Springfield, MA 70 0-1 Montpelier, VT 525 1-2Providence, RI 80 0-1 Wilkes-Barre, PA 550 1-2Jersey City, NJ 83 0-1 Buffalo, NY 585 1-2

Central Islip, NY 88 0-1 Erie, PA 650 1-2Newark, NJ 95 0-1 Pittsburgh, PA 770 2-3

Baltimore, MD 100 0-1 Binghamton, NY 865 2-3Wilmington, DE 100 0-1 Pittsfield, MA 1039 3-4

Lowell, MA 102 0-1 Johnstown, PA 1200 3-4Brockton, MA 112 0-1