CARB Continuous PM 2 5 Monitoring Activity BAMs

CARB Continuous PM 2. 5 Monitoring Activity (BAM’s) Reggie Smith California Air Resources Board

Continuous PM 2. 5 Monitor Network • ARB Ambient Air Monitoring Sites – 13 Sites with BAM-1020 Monitors (17 units) – 3 Special Purpose Sites (6 units) – 61 total samplers • 4 Collocated BAM-1020 Sites • 9 Sites with FRM and BAM

Standard CARB BAM Configuration • • PM 10 Sampling Inlet (BX-802) Sharp Cut Cyclone (BX-807) Smart Heater Met Translator Option (BX-964) Firmware v 2. 58 Gast Rotary Pump (BX-121) Volumetric Flow Control

Data Analysis • SLOPE: Indicator of the bias of the BAM compared to the FRM • INTERCEPT: Offset between the BAM and FRM • r 2: Correlation coefficient of the linear regression between the two instruments

BAM-1020 Accuracy

BAM-1020 Precision

Network Summary • Overall BAM Network Performance – All BAM/FRM data regressed as one data set – Slope of 0. 990 – Intercept of 3. 07 – r 2 of 0. 940

BAM Maintenance • Bi-Weekly Leak and Flow Checks are absolutely necessary to ensure properation • Failed leak and flow checks are associated with poor FRM correlation in ARB’s experience • Adhere to AQSB SOP 400 (BAM Standard Operating Procedures)

CARB Zero Test • Sample Zero air using BX-302 HEPA Filter • 76 consecutive hours (First 4 hours removed) • Background set to 0. 000 • Min/Max Zero test range of 14 ug/m 3 • No value exceeding 20 ug/m 3 • Any errors during test, re-run test • Field zero test annually (24 hour test)

BAM Datalogger Review • Review of the internal datalogger is important • Reveals offsets between the BAM and the external data acquisition system • Review of Qtot (total volume sampled) hourly values helps detect flow problems • Detailed error codes are stored in the internal datalogger data

Conclusions • The BAM-1020 Monitor is well-suited for PM-AQI, Prescribed Fire and Ag-Burn Forecasting, diurnal profiling, quantifying short term events, and characterizing atmospheric dynamics • Is it good enough for regulatory determinations?

Next Steps • Evaluate data using U. S. EPA’s Criteria Designation of Equivalence Methods for Continuous Surveillance of PM 2. 5 • Determine how good is good? – Slope: 1. 00 +/- 5% – Intercept: 3 ug – Correlation: r 2=. 940 (r =. 97)

Summary • Contact Information – Voice: (916) 327 -1238 – E-mail: rsmith@arb. ca. gov • CARB BAM Website – http: //arb. ca. gov/amtac/phpnuke/