1. NADP Passive Ammonia Monitoring Network (AMoN) Melissa Puchalski, US EPA, CAMD Mark Rhodes, NADP Program Office Chris Lehmann, NADP Central Analytical Laboratory Donna Schwede, US EPA, ORD Jesse Bash, US EPA, ORD NADP Spring 2012 Portland, OR

2. Network Status 53 Active Sites 3 New sites: – Georgia Station, GA41 – Logan, UT01 – Salt Lake City, UT97 No sites were shutdown since last update

4. Data Availability 35 AMoN sites collocated with CASTNET 145 site-years available Site photos available on the AMoN website Bi-weekly replicate samples or triplicate average concentrations – Triplicates at 5% of the sites – Travel blanks to all sites

6. Independent QA Independent audit SOW now includes identifying any violations to the siting criteria at AMoN (and AMNet) sites that are collocated with CASTNET, NTN, MDN or AIRMoN Contractor will also take photographs of the site and submit to the PO

7. Ammonia Concentrations

8. Data Quality Assurance Elevated Travel Blanks – Mark Rhodes Variability in Triplicates – Chris Lehmann

9. Estimated Deposition Fluxes Using AMoN seasonal concentrations + 2002 CMAQ deposition velocities

10. Contribution of NH 3 to “total” N deposition Caveats!!! – Average annual NH 3 dry deposition calculated from: 2011 bi-weekly concentrations (AMoN) 2002 weekly CMAQ vd’s – CASTNET/NTN wet and dry deposition estimated from 2009 total deposition (annual)

11. SND152/AL99 ABT147/CT15 KNZ184/KS31 NH 3 dry NH 4 dry NO 3 dry HNO 3 dry NH 4 wet NO 3 wet

12. Bi-directional flux 2002 annual simulation with bi-directional science option in progress 2006 annual simulation will be next Work with ORD to understand how we can use bi-weekly NH3 (and hourly Hg) concentrations with the bi-directional deposition velocities to estimate flux at AMoN/AMNet sites

13. Special Studies ACCS Update NOx/SOx Secondary Standard Field Pilot Program

14. Ammonia CASTNET CSN Study (ACCS) Two journal articles – NH3 comparison between AMoN, URG denuders, MPPDs in Super SASS – Ion comparison between CASTNET filter pack, URG denuders, Super SASS canisters (CSN) Final data being QA’ed Schedule – mid-summer, early fall submittal

15. NOx/SOx Secondary Standard Field Pilot Program Implementation Final Rule announced on March 20 th - no new standard set Proposal to implement a Field Pilot Program (FPP) to enhance understanding of the level of protectiveness we could expect from a multi-pollutant standard 3-5 eco-regions to be selected 5 year program to address uncertainty in developing a standard based on eco- region specific AAI values Standard measurements at proposed FPP sites include: – CASTNET filter pack (SO 2, SO 4 ) – direct input to the AAI – Continuous NOy – direct input to the AAI as total reactive N Additional measurements may be added to some sites to complement these basic measurements – NTN – AMoN – PM 2.5 speciation – Total NO 3 from the CASTNET filterpack – Continuous SO 2 – True NO 2

16. AMoN ACCS Study – ARE128/PA00

18. FL11 WY94 TN01 IL46 CA83 WY94 OH54 CA67 OH02 AZ98 CO88 OK99 ID03 NC26 FL11 GA41 SC05 WY94 WA99 Local source of ammonia reported NC25