network design monitoring goals
TRANSCRIPT
NETWORK DESIGN: MONITORING GOALS
Karen Magliano Assistant Chief
Air Quality Planning and Science Division
California Air Resources Board
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OVERVIEW
• Extent of monitoring network
– Introduction to Minimum Monitoring Requirements
• How data are used
– Regulatory
– Non-regulatory
• Data impacts
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AIR MONITORING NETWORK
• Well established
• More than 250 sites with 650 instruments in 53 counties
• Designed to assess statewide, regional, and local air quality
4
MINIMUM MONITORING REQUIREMENTS
• CFR specifies network design criteria and technical monitoring requirements
• Number of sites
• Spatial scale
• Instrument type & measurement method
• Monitoring season & operating schedule
• QA procedures
• Data reporting requirements
• Revised standards = new requirements
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DETERMINING COMPLIANCE WITH AIR QUALITY STANDARDS
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• Identify areas that meet the standards
• Regulatory action requiring complete, quality assured, and certified data
• Certified data meet all federal requirements
PRIORITY MONITORING SITES
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• Key sites are critical for regulatory decisions
• Basis for developing plans
• Determine attainment
• Complete data are essential
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8-H
ou
r O
zon
e D
esig
n V
alu
e (p
pm
)
Sacramento Metro Area 8-Hour Ozone Design Value Trend
Federal Standard
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PRIORITY SITES ARE CRITICAL!
• Most areas have multiple sites
• Area does not attain until ALL sites meet standard
• Site with highest concentrations is highest priority
STATE IMPLEMENTATION PLAN & CONTROL STRATEGY DEVELOPMENT
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• Data used to:
– Determine area design value and level of control
– Evaluate nature of problem
– Run models and evaluate performance
EXCEPTIONAL EVENTS DOCUMENTATION
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• Approved days excluded from regulatory process
• Data used to evaluate conditions before, during, and after event
• Need meteorological and air quality parameters
• Observations & field notes very important
AIR QUALITY TRENDS
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0
20
40
60
80
100
120
140
160
Coastal Valley Inland
Num
ber
of D
ays
Days Above 8-Hour Ozone Standard South Coast
1990 2010
• Evaluate progress toward attainment
• Compare progress in different areas
• Estimate exposure
• Assess effectiveness of control strategy
DATA SUPPORT A BROAD RANGE OF OTHER PROGRAMS
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• Support health studies
• Basis for regulatory programs such as vapor recovery and off-road riding seasons
• Critical part of emergency response efforts
• Inform community assessments and environmental justice evaluations
AIR QUALITY INDEX
• Familiar to most people
• Indicates the healthfulness of current air quality
• Based on real-time measurements at monitoring sites
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BURN DECISIONS AND AIR QUALITY ALERTS
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• Uses real-time data to forecast conditions
• Supports public notifications
• Helps prevent exceedances and protect public health
WHAT’S THE POINT?
• Reliable data are critical to regulatory process
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• Must meet established siting, operating, reporting standards
• Annual network plans and data certifications document performance
• Data that do not meet standards can compromise regulatory decisions
THE DOMINO EFFECT
PM is good example
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• Limited samples – need 75% data completeness
• Make-up samples must be on acceptable days
• Missing just a couple of samples, can invalidate month, quarter, or year
• Incomplete data impact design value and cannot be used to justify attainment
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VALID MAKE-UP SAMPLES VS. EXTRA SAMPLES
Su M Tu W Th F Sa
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2 3 4 5 6 7 8
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16 16 18 19 20 21 22
23 24 25 26 27 28 29
30 31
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SAMPLING ON THE CORRECT DAYS MAKES A BIG DIFFERENCE
Total Samples 102 102
Creditable Samples 92 102
98th Percentile 72.3 µg/m3 61.3 µg/m3
Rank from Top 2 3
Design Value 61 µg/m3 66 µg/m3