Advanced Monitoring Technologies Laki Tisopulos, Ph.D., P.E. Assistant Deputy Executive Officer Science & Technology Advancement South Coast AQMD

A&WMA West Coast Section Conference Diamond Bar - October 15, 2015

Ongoing SCAQMD Initiatives Air Quality Sensor Performance Evaluation Center (AQ-SPEC)

Fence-line / Optical Remote Sensing Air Monitoring Program

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Low-Cost Air Quality Sensors Rapidly proliferating Tremendous potential o Low cost o Ease of use

Multiple potential applications Spatial/Temporal air quality info o Fence-line applications o Regulatory/Academic/Citizen’s science

How reliable/accurate are they???? 3

AQ-SPEC - Background Main Goals & Objectives o Provide guidance & clarity for ever-evolving sensor technology & data interpretation o Catalyze the successful evolution/use of sensor technology o Minimize confusion AQMesh

CairClip

Shinyei

Dylos (prototype)

DC1100 Pro

SmartCitizens

Sensor Selection Criteria o Potential near-tern use o Real- or near-real time o Criteria pollutants & air toxics o Turnkey products first o Price range: < ~$2,000 (purchase) > ~$2,000 (lease/borrow)

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AQ-SPEC - Overview FIELD TESTING

LAB TESTING

(Side-by-side comparison w/ FRMs)

(Controlled conditions) RH = 30% T = 25C

vs Conc = 10 ppb

RESULTS (Categorize sensors based on performance)

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AQ-SPEC – Overview (continued)

SCAQMD Website / Clearinghouse

RESULTS Vendors

AQ Officials Community

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AQ-SPEC - Field Testing Started on 09/12/2014 o Sensor tested in triplicates oTwo month deployment o Locations: Rubidoux station • Inland site • Fully instrumented I-710 station • Near-roadway site • Fully instrumented

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AQ-SPEC - Lab Testing

Test for: o Linearity of response (range) o Accuracy and precision o Lower detectable limit o Concentration resolution o Response time o Co-pollutant interference o RH and T influence o Other

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AQ-SPEC - Preliminary Field Testing Results Cost

Time Resolution

Sensor vs FEM/FRM Method*

PM2.5

~$200

1 min

R2~0.75

Optical

PM(0.5-2.5)

~$300

1 min

R2~0.85

Optical

PM1 PM2.5 PM10

~$400

15 sec

R2~0.85 R2~0.90 R2~0.80

Optical

PM2.5

~$1,000

1 min

R2~0.80-0.90

Optical

PM2.5

~$1,900

15 sec

R2~0.70

Optical

PM2.5

~$2,000

10 sec

R2~0.80

Manufacturer (Model)

Type

Pollutant(s)

AirBeam

Optical

Dylos (DC1100) Alphasense OPC-N2

Shinyei (PM Evaluation Kit) MetOne Neighborhood Sensor

RTI (MicroPEM) *Comparisons

refer to 1-hr average data; results are still preliminary; laboratory evaluations needed to confirm

field results

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AQ-SPEC - Preliminary Field Testing Results (continued) Manufacturer (Model)

Type

Pollutant(s)

Cost

Time Resolution

Sensor vs FEM/FRM

Method*

Smart Citizen Kit

Metal oxide

CO, NO2

~$200

1 min

R2(CO)~0.85 R2(NO2): unreliable

Aeroqual (S-500)

Metal oxide

O3

~$500

1 min

R2~0.95

1-15 min

R2(CO)~0.85 R2(NO)~0.85 R2(NO2)