• EPAtrailerlocatednearUSUcampusinLogan,UT– Picarro @EPAtrailer– NH3,CO2,CH4

• ≈5secdata– Sampled1-16-17to2-14-

17• UDAQCVmonitoringsite

locatedinSmithfield– approx.9.8kmfromEPA

trailer– approx.28melevation

difference(SMlower)

CacheValleySampleLocations

UDAQ24-hrPM2.5

Picarro capturedpartsof3inversionevents

Picarro Data(CO2 andCH4)

10dayinversionevent

Picarro Data(NH3)10dayinversionevent

WhytheNH3 depletion??

Jan/Feb2016PassiveNH3 (NADPtalk)

WasatchFront2016NH3:14.2µg/m3(≈20ppb)

CV2016NH3:106.6µg/m3(≈153ppb)− five7-daysampleperiodsin2016− 2006winterNH3:29.1µg/m3(≈42ppb)

USUsite≈50µg/m3

(72ppb)

2107PassiveNH3 SamplingNetworks• Ogawapassive

NH3 samplers

• ICanalysis(USDA,Dr.PhilSilva)

• 25sitesinCacheValley– Somesites

intentionallocatednearprobablehighemissionareas

• 11siteslocatedalongtheWasatchFront