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pqao -- Changes to the ARB Audit Program for 2012

Posted: 06 Jan 2012 13:26:12
The California Air Resources Board (ARB) would like to alert you
to two changes to the ARB audit program for ambient air
monitoring stations.    

1.  Ozone Audit Levels

ARB is responsible for conducting performance audits for ozone
monitors in California (40 CFR, Part 58, Appendix A, Section
3.2.2).  Effective January 1, 2012, the following ozone audit
levels will be used by ARB: 

Level 4 (0.040-0.069): mid-point target is 0.055 
Level 6 (0.090-0.119): mid-point target is 0.105 
Level 8 (0.140-0.169): mid-point target is 0.155 

The new audit levels are based on:
•Distribution of ozone 1-hr max values in California (2008-2010)

•Represent or bracket 80% of ambient concentrations measured in
•EPA’s Memo on PE levels
•Consistency with national performance audit program (NPAP) audit

2.  Semi-annual Flow Rate Audits

Semi-annual flow rate audits are required every six months for
PM10, PM10-2.5, and PM2.5 particulate analyzers (40 CFR, Part 58,
Appendix A, Section 3.2.4).  In the past, ARB conducted one
required flow audit and a U.S. EPA contractor conducted the
second required flow audit.  Effective January 1, 2012, ARB will
conduct both semi-annual flow rate audits.  The two flow audits
will be conducted 5 to 7 months apart each calendar year.
If you have any questions regarding the audit changes for 2012,
please contact Merrin Wright, Manager, Quality Assurance Section,
at (916) 324-6191, or by email at mwright@arb.ca.gov.

For additional information regarding the ARB PQAO, please visit
the ARB PQAO Homepage at:

For additional information regarding the ARB audit program for
air monitoring stations, please visit the Quality Assurance
Performance Audits Homepage at:

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