Low-Cost IAQ Monitors: Do you get what you pay...

Bre�SingerandWoodyDelpLawrenceBerkeleyNa�onalLaboratory

Low-CostIAQMonitors:Doyougetwhatyoupayfor?

2017RESNETCONFERENCESco�sdaleAZ28-Feb-2017

SydneyRobertsSouthfaceEnergyIns�tute

  Excellentorverygood

  Good/almostalwaysacceptable

  Some�mesnotacceptable

  Frequentlynotacceptable

 Pollutantconcentra�onsatsafelevels

Safe Hazardous

AmbientAQstandards

Referenceexposure

levels

Concentra�on

pDRPurpleAir

AWAIRSpeck

AirVisual NODE

PM2.

5 (μ

·m-3

)

0

100

200

300

400

500

600

18:00 21:00 0:00Feb 24 & Feb 25

Candles

Chalk Candles

pDR(black)isresearchgrademonitor

pDRPurpleAir

AWAIRSpeck

AirVisual NODE

PM2.

5 (μ

·m-3

)

0

20

40

60

80

100

120

140

10:00 12:00 14:00 16:00Feb 25 - 2017

FrenchToast

Bacon

pDR(black)isresearchgrademonitor

Internetdown

pDRPurpleAir

AWAIRSpeck

AirVisual NODE

PM2.

5 (μ

·m-3

)

0

100

200

300

400

500

600

700

8:00 10:00 12:00 14:00Feb 26 - 2017

Friedeggs

Quesadilla

pDR(black)isresearchgrademonitor

  TVOC  Odors

  Irritants  Allergens

  Dampness&mold

  TVOC  Odors

Peopledetecttheseeasily

ultrafines  Acrolein

  Irritants  Allergens

ultrafines

  Dampness&mold

  TVOC  Odors

Nothingaccurateandaffordableisavailable

ultrafines  Acrolein NO2

  Irritants  Allergens

  Ozoneultrafines NO2

  Dampness&mold

  CO2fordemandcontrolven�la�on  VOCs  Odors

Candetectrelevantlevels,butexpensiveandrequiresfrequentcalibra�ons

ultrafines  Acrolein NO2

  Formaldehyde,radon  Irritants  Allergens

  Ozoneultrafines NO2

  Dampness&mold

  CO2fordemandcontrolven�la�on  VOCs  Odors

Rela�velyinexpensive�me-integratedtestsavailable

ultrafines  Acrolein NO2 CO

  Formaldehyde,radon  Irritants  Allergens

  Ozoneultrafines NO2

  Dampness&mold

  Temperatureandhumidity  CO2fordemandcontrolven�la�on  VOCs  Odors

Inexpensivesensorsavailable,accurateenoughanddurable(2+y)

  PM2.5,PM10 ultrafines  Acrolein NO2 CO

  Formaldehyde,radon  Irritants  Allergens

  DieselPM/blackcarbon  Ozone  PM2.5,PM10 ultrafines NO2

  Dampness&mold

  Temperatureandhumidity  CO2fordemandcontrolven�la�on  VOCs  Odors

Inexpensivesensorsavailableandaccurateenough;durabilityuncertain

  PM2.5,PM10, ultrafines  Acrolein NO2 CO

  Formaldehyde,radon  Irritants  Allergens

  DieselPM/blackcarbon  Ozone  PM2.5,PM10,ultrafines NO2

  Dampness&mold

  Temperatureandhumidity  CO2fordemandcontrolven�la�on  VOCs  Odors

Inexpensiveandaccurateenoughsensorsbeingusedforresearch

  PM2.5,PM10, ultrafines  Acrolein NO2 CO

  Formaldehyde,radon  Irritants  Allergens

  DieselPM/blackcarbon  Ozone  PM2.5,PM10,ultrafines NO2

  Dampness&mold

  Temperatureandhumidity  CO2fordemandcontrolven�la�on  VOCs  Odors

InexpensiveAvailable,butcostlyComingsoon

Device Price Temp RH CO2 VOC PM2.5 PM10 CO Ozone NO2

Birdi (NA) $119

Koto Air Cubes $139

Netatmo $149

Speck $149

Airmentor $183

Awair $199

BlueAir-Aware $199

Foobot $199

Air Quality Egg $280

Dylos-DC 1100 $290

uHoo (NA) $299

Device Price Temp RH CO2 VOC PM2.5 PM10 CO Ozone NO2

Birdi (NA) $119

Koto Air Cubes $139

Netatmo $149

Speck $149

Airmentor $183

Awair $199

BlueAir-Aware $199

Foobot $199

Air Quality Egg $280

Dylos-DC 1100 $290

uHoo (NA) $299

SomewhatYes No NotclearfromproductliteratureCredit:LaurenLawson

Source:NARSTO(2004)2.5

PM2.5

Source:NARSTO(2004)2.5

PM2.5

Kleeman,Schauer,Cass(1999)ES&T

Burningoakwood Meatcharbroiling Smokingcigare�e

Volumedistrib

u�on

Massdistrib

u�on

Lowcostsensorsseeonlytheparttorightofredline

Integratednumber(hours–day)

Real-�me(seconds–hour)

Researchdevices:$1000sto>$10K

  Islikelookingoutanarrowdoorway

  Somethingpassesbyandblocksthedoorwaygenera�ngapulse

  Longer/biggerpulseisabiggerpar�cle

Sca�eringLight

Miesca�eringduetofog(waterdroplets)

Researchgrade Lowcostdevice

BaresensorOEMpricing$4-$15

OEMpricing$100s

Moldedplas�chousingTolerances?

Researchgrade Lowcostdevice

MachinedhousingClosetolerances

HeaterinducesaflowthroughthedeviceControl?

Researchgrade Lowcostdevice

Pumpforcontrolledflows

Op�calchambergetsloadedwithdust,poten�allychangingtheflowandresponse

Researchgrade Lowcostdevice

Sheathflowkeepstheop�calchamberclean

h�p://mobilesensingtechnology.com/

h�p://www.osbss.com/

Thisismostdifficultformostusers.Needmanufacturersandstandardstoensurequality.

h�ps://www.epa.gov/air-sensor-toolbox

h�p://www.aqmd.gov/aq-spec/home

h�ps://explorables.cmucreatelab.org/explorables/air-quality-monitor-tests/

h�p://aqicn.org/sensor/

$280

CloudStorage Yes

Devices n/a

PM,T,RH

Group R2

EPA -.06to0.40

SCAQMD 0.79to0.85

CMU 0.72

$250

CloudStorage Yes

Devices Android

PM

Group R2

EPA 0.65to0.66

SCAQMD 0.65to0.70

CMU n/a

$199

CloudStorage Yes

Devices iOS,Android

Group R2

EPA n/a

SCAQMD 0.55

CMU 0.25

PM,T,RH,CO2,CO,tVOC

9

$199

CloudStorage Yes

Devices ?

Group R2

EPA n/a

SCAQMD 0.77to0.92

CMU n/a

PM

$199

CloudStorage Yes

Devices iOS,Android

Group R2

EPA 0.01

SCAQMD 0to0.25

CMU 0.61

PM

Dacunto(2015)

Dacunto(2015)

Yep.It’scomplicated.

LBNLworkingonbibliographyofscien�ficpapersofsensorperformance.

bcsinger@lbl.gov

sroberts@southface.org