BIPM Virtual Workshop on Accurate Monitoring of Surface Ozone
5-9 October 2020 (online)
Implementing a Globally Coordinated Change in Ozone Cross-Section Value
for Surface Ozone Monitoring
for Surface Ozone Monitoring
Workshop Executive Secretary
J. Viallon
BIPM
Steering Committee
P. Brewer
NPL
R.I. Wielgosz
BIPM
S. Lee
KRISS
I. Chubchenko
VNIIM
J. Carney
NIST
J.T. Hodges
NIST
J. Norris
NIST
K. Saarnio
FMI
N. Ntsasa
NMISA
A. Borowiak
JRC
Objectives
The reference method for ground-level ozone measurements is based on UV photometry, with replicates of the NIST Standard Reference Photometer (SRP) acting as primary standards for numerous national and international ozone-monitoring networks. Measurements of ozone amount fractions in ambient air are thus ultimately anchored to the value of the ozone absorption cross-section at the wavelength 253.65 nm. A consensus value with the smallest uncertainty ever achieved was published in 2019.
Global coordination is now required to implement the 2019 value, which will increase the measured atmospheric ozone concentrations. The workshop aimed to gather representatives of reference laboratories, monitoring networks, legislators, and ozone analyser manufacturers to develop a plan and timetable for the adoption of the 2019 value.
Schedule
The virtual workshop included five on-line sessions from Monday 5 to Friday 9 October 2020, each session starting at 12:00 (UTC+2):
- Monday: Surface ozone measurement and its impact / Survey feedback
- Tuesday: International standards, calibration services and monitoring networks
- Wednesday: Air quality normative aspects; ozone analyser manufacturing
- Thursday: Break out session for Task Groups
- Friday: Feedback from Task Groups, conclusions and recommendations
CCQM-GAWG Statement
Following stakeholder consultation during the Workshop, the CCQM Gas Analysis Working Group is issuing a statement on its intention to change the Ozone Cross-Section Value used for Surface Ozone Standards and Measurement.
Workshop documents
Statement
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Intention to change the Ozone Cross-Section Value for Surface Ozone Measurement
Agenda
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Agenda
Presentations
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Welcome, introduction and workshop aims
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Impact of surface ozone on human health and the environmental
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The 2019 Ozone Cross-Section consensus value at 253.65 nm
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Benefits to uniformity of atmospheric ozone measurements
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Impact of the ozone cross−section on air quality compliance
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Results of the on-line survey
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Primary Surface Ozone Standard Reference Photometers and BIPM.QM-K1
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Calibration services for ozone standards and instruments Within United States of America
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Calibration services for ozone standards and instruments Within Switzerland
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Past ozone cross−sections transitions in Total Ozone measurements
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Asia Network of surface ozone monitoring
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Californian air monitoring network
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Aquila and European Air quality Reference Laboratories
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Ozone cross-section change, the CEN perspective
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Ozone traceability, surface monitoring impacts, and potential implementation issues in the United States
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Impact on national ozone monitoring network by the new ozone absorption cross-section value in Korea
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National surface-level ozone analyzers in Russia
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TG1 Report: Identifying and implementing change
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TG2 Report: Time line for Change
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TG3 Report: Communicating Change
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TG4 Report: Managing Change