Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Improving Measurement for Smokestack Emissions

Through measurement science, enable the owners of stationary sources (primarily the electric power industry) and their regulatory agencies (federal and state) to better characterize greenhouse gas (GHG) emissions.  The intended result is to create sound scientific data that can be used to determine if local and global emission targets are being met.  This workshop brought together diverse stakeholders to share perspectives, discuss strengths and weakness of current CO2 flux measurement protocols, and introduced new methods that reduce uncertainty and clearly tie emissions measurements to national standards.

Workshop Topics

  • Calibration and uncertainty of pitot probes used in relative accuracy test audits (RATAs)
  • Innovative flow measuring techniques applicable for smokestacks
  • CO2 emission traceability for stationary sources
  • Advanced multipath ultrasonic meters for improved flow measurement
  • Concentration and flow rate measurement uncertainty for continuous emissions monitoring systems (CEMS) and RATA testing
  • Fuel calculation method for determining CO2 exhaust for natural gas or coal
  • Challenges of accurately measuring smokestack CO2 emissions

Who Attended

Representatives of organizations and institutions with key roles in measuring CO2 emissions from power plant smokestacks.

  • State and federal regulatory agencies (US EPA as well as environmental policy regulators from other countries)
  • National Metrology Institutes with expertise in concentration or particularly in flow measurement
  • RATA testers and power plant stake holders
  • CEMS equipment operators and manufacturers
  • Power plant stake holders
  • Intergovernmental Panel on Climate Change (IPCC)

Agenda (Printable PDF) Updated 6/26

Preliminary Agenda – Improving Measurement for Smokestack Emissions – June 28, 2017

June 28, 2017


Title / Item

Name / Organization

8:15 AM



8:30 AM

Workshop Overview

Rodney Bryant / Aaron Johnson, NIST

8:45 AM

Overview of Fluid Metrology and Greenhouse Gas Measurements Programs

John Wright / James Whetstone, NIST


Session 1 - Air Emissions Testing Bodies (AETB)

9:00 AM

Accreditation of Air Emission Testing Bodies for GHG Measurements and Data collection

Scott Swiggard, Golden Specialty, Inc.

9:15 AM

2016 Updates to ASTM D7036 - A Quality Management Standard for Emission Testing

David Elam, TRC Environmental Corp.

9:30 AM

Evaluation of Uncertainties in Reference Method Velocity Probe Calibration Procedures

Tom Martz, EPRI

9:45 AM

Breakout for AETB Discussions

Instructions for Breakout Session

Rodney Bryant / Aaron Johnson / John Wright, NIST




Session 2 - Flow Measurements

10:15 AM

Comparative Blinded Flare Gas Flow Measurement Study, Flow Measurement Uncertainty Using Tracer Gas Dilution Method

Eric Harman, CEESI

10:30 AM

Utility Stacks are Not Designed for Accurate Flow Measurement

David Nuckols, Dominion Energy

10:45 AM

Progress of NIM's Smoke Stack Simulator and Field Measurements in Power Plants

Liang Zhang, NIM China

11:00 AM

Experimental Investigation on Geometric Parameters of S-type Pitot tube for Greenhouse Gas Emission Monitoring

Wong Kang, KRISS

11:15 AM

Breakout for Flow Measurement Discussions





11:45 AM



Session 3 – Presentations and Tours of NIST Research Facilities

1:00 PM

Stationary Source Emissions Research at NIST

John Wright, NIST

1:15 PM

Transportation to tour sites


1:30 PM

National Fire Research Laboratory and Results of Smokestack Emissions Measurements

Rodney Bryant, NIST

2:30 PM

Scale Model Smokestack Simulator

Aaron Johnson, NIST

3:15 PM

Wind Tunnel, Air Speed Calibration Facility Tour and Probe Calibrations & RATA Results

Iosif Shinder/Aaron Johnson, NIST

4:00 PM

Long-Wavelength Acoustic Flowmeter

Keith Gillis, NIST

4:30 PM

Breakout for NIST Research Facilities Discussions

(Bldg. 101/West Square)


5:30 PM




June 29, 2017


Title / Item

Name / Organization

Session 4 -  Ultrasonic Flow Meters

8:30 AM

Plan for the Day


8:45 AM

Multipath Ultrasonic Configurations and When to Use Them

Salvator Vigil, Teledyne

9:00 AM

NIST Experiences with Multipath Ultrasonic Flow Measurements in Scale-Model Smokestack Simulator

Aaron Johnson, NIST

Session 5 – Close Out Discussion

9:30 AM

Discuss and Recap


11:00 AM

Net-Zero Energy Residential Test Facility Tour



12:00 PM




Created January 4, 2017, Updated March 12, 2020