emerging air sensors: challenges and opportunities

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Emerging Air Sensors: Challenges and Opportunities. Donnie Redmond NC DAQ Ambient Monitoring. Disclaimer. I have no particular expertise with these new sensors I’m not a tech geek … but I live near RTP and can go to the workshops!. Recent NC Experience. - PowerPoint PPT Presentation


Next Generation of Air Monitoring

Emerging Air Sensors:

Challenges and OpportunitiesDonnie RedmondNC DAQ Ambient MonitoringDisclaimerI have no particular expertise with these new sensorsIm not a tech geek

but I live near RTP and can go to the workshops!Recent NC ExperiencePermit hearing comments on cement plant at the coastMedical doctor did survey with hand-held monitor Followed sampling protocol used in academic researchPM 2.5 levels ranging from mid-30 to mid-40 g/m3. The EPAs current standards state that levels should not exceed 12 g/m3.Real-time monitoring differs from the NC DAQ monitoring protocol in that these monitors measure actual exposure levels of PM 2.5 directly in real life settingsparents strolling their babies, children playing in parks, young and mature adults running, playing sports and bicycling.NC DAQ monitoring station is remote and offlineHearing officer response Wow, this looks pretty bad!Apples and OrangesTSI 8534 Hand HeldDusttrak DRXIndustrial dust monitorDevice is not an FRM or FEMTook a five-minute average at each locationCompared it to daily standard (12 g/m3)Essentially a three-year average of 24-hour averagesWould not have violated the annual standard (35 g/m3)Did not take any readings at our monitorSiting questionsSites used not likely suitable for ambient monitorFRMs are non-continuous; FEM has maintenance periodsFollow our webpage for one-hour spikes on continuous monitorsThe more important issueCitizens arent going to understand the EPA standards and siting requirementsThey dont know the difference between FRM, FEM, BAM, TEOM, PM10, PM2.5, TSP, 1-in-12, etcThey may not even trust the government monitoring

But they have these new gadgets and theyre gonna use them!What are we going to do about?

North Carolina perspectiveChallenges*Citizen groupsAh ha! Now we can do our own testing and see what the government has been hiding from us!Management and bean countersThis stuff is cool and a lot cheaper than what youre doing!Monitoring staffThose things are all junk and they dont work! (Thinking: Uh oh! What if this stuff works and they dont need me anymore?!) * Donnies real or perceived challengesNorth Carolina perspectiveOpportunities!New tools toRespond to citizen complaintsTarget compliance activitiesMore data for modelersSupplement ambient network to better select sitesBut must be able to trust the technologyRespond to citizen complaintsOdorsAnimal operationsGasoline vapor recoverySuspicionsNot in my neighborhoodTarget compliance activitiesDrive by spot checksMounted in regional office staff vehiclesLess reliance on visible emissions or complaintsScreening only not basis for actual enforcementFollow up with more traditional methodsMore data for modelersThey are accustomed to imperfect dataVehicle counts, emissions inventories, met dataLocal data preferred over national default valueImperfect ambient data still usefulFocus on relative vs. absoluteTweak the model to resemble what really happened

Supplement ambient networkSite locationInstead of modeling or guessingArray of inexpensive devicesAbsolute values may be offPay attention to relative valuesFill in gaps in networkCan you trust the technologyKnow the limitations of specific devicesFast, cheap, or good pick twoAttainment monitor: must be goodAccept higher uncertainty for other purposesInitial complaint response: fast and cheapMaybe 30% is good enough for screening

Info, verificationNot only have technical info available but Some level of training for the folks who are selling, operating, and using the dataSales reps may not understand what theyre offeringNon-technical operators/users who dont know CO from CO275 ppb from 0.075 ppmManaging expectationsMaybe it gives you a numberIts still not an FRMNWS has been hereNational Weather Service has learned how to incorporate data gathered by the public

The Citizen Weather Observer Program (CWOP) is a public-private partnership with three main goals: 1) to collect weather data contributed by citizens; 2) to make these data available for weather services and homeland security; and 3) to provide feedback to the data contributors so that they have the tools to check and improve their data quality. In fact, the web address, wxqa.com, stands for weather quality assurance.SummaryProbably very useful tools coming out!Expect them to supplement (not supplant) existing networkNeed means to sort out the good stuff from junkQuestions?Donnie RedmondNorth Carolina Division of Air QualityAmbient Monitoring Section Chief919-707-8468donnie.redmond@ncdenr.gov


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