David Warren Bearg                                                   Birth Date:                   July 3, 1948

20 Darton Street                                                          Marital Status:             Married, 2 children 

Concord, Massachusetts 01742                                  Citizenship:                 U.S.A.

978-369‑5680                                                                         E-mail:   





1971    Chemical Engineering, Cum Laude                 B.S.  Northeastern University

1973    Environmental Health Sciences                       M.S.  Harvard School of Public Health         




                        State of Massachusetts, Registered Professional Engineer      #30382


                        American Board of Industrial Hygiene, Certified Industrial Hygienist, # 6519





August 1980 to present


LIFE ENERGY ASSOCIATES, Concord, Massachusetts, President. 


Indoor Air Quality Evaluation.  Provide indoor air quality diagnostic and mitiga­tion services, especially with regard to maximizing the healthfulness of indoor environments at the lowest energy cost.  Services provided include helping clients achieve LEED IEQ Credits and Prerequisites, as well as performing assessments of the actual effectiveness of ventilation systems (in delivering outdoor air to building occupants) by both carbon dioxide measurement and sulfur hexafluoride tracer techniques.  Tracer testing is also performed to assess leakage rates and identify pathways of air movement through enclosures (buildings, air-to-air heat exchangers, gas isolation boxes, mouse cages, anaerobic digester tanks, etc.)  This testing has also been performed to characterize and quantify the amount of dilution occurring between sources, such as loading docks, and receptors, such as office spaces.


            Full range of Industrial Hygiene services are also provided including the measurement and analysis of air contaminants either in achievement of the testing required for a LEED Credit or to assess worker exposures. 


            Performed measurements of specific indoor air contaminants, including respirable particulate matter, volatile organic compounds, radon, fungi and bacteria.  Major study performed for Massachusetts Tobacco Control Program to measure the public's exposure to environmental tobacco smoke (ETS) in restaurants. Also available as a lecturer on Indoor Air Quality.



September 1993 to present


AIRxpert Systems, Inc.  Lexington, Massachusetts.  Director of IAQ Programs.


As a founding principal in this firm, responsibilities have included the development and refinement of monitoring equipment and techniques, as well as the recommendation of specific locations for sampling and the interpretation of the resulting monitoring data.  Accomplishments have also included the preparation of articles for technical journals and presentations at conferences to share the information achieved with this high quality monitoring of carbon dioxide, carbon monoxide and absolute humidity.





      2007            Member, Integrated Design Team, new Willard Elementary School, Concord, MA


1998 – 2001      Leader of Indoor Air Quality Task Force for the Energy Advisory Committee of the Massachusetts Board of Building Regulations and Standards (BBRS)


August 1999     Invitee to Green Building Council’s Expert Review Workshop on Upgrading the LEED™ Building Rating System, Pocantico Conference Center, New York


1994 – 1997      Member of Phase 2 Concord-Carlisle High School Building Committee    


1990 ‑ 1992        Reviewer Member of National Institute of Building Sciences (NIBS) Committee on Building Envelope Design Guidelines                                


1987 ‑ 1989        Member of the Commonwealth of Massachusetts Special Legislative Commission to Investigate and Study the Public Health Effects of Indoor Air Pollution            




1.              Speaker on Maintaining IAQ while Saving Energy.  ASHRAE, Boston Chapter.  Waltham, MA.  October 14, 2008. 


2.              Trainer/Instructor for the Indoor Air Quality component of the Building Operator Certification (BOC) Program administered by the Northeast Energy Efficiency Partnerships, Inc.  Assignments began in 2004 and are ongoing through 2008.


3.              Lecturer on Maximizing Indoor Air Quality as part of the Commercial Green Building Course, Natick, MA.  April 25, 2008.


4.              Presenter on Improving Building Performance for IAQ and Energy Use.  Build Boston, Boston, MA.  November 16, 2006. 


5.              Teacher of Professional Development Course on "Indoor Air Quality and HVAC Systems" as part of the American Industrial Hygiene Conference & Exposition, Atlanta, GA, May 9, 2004; Washington, D.C., May 18, 1996; Kansas City, Missouri, May 20, 1995; Anaheim, California, May 21, 1994; New Orleans, Louisiana, May 15 & 16, 1993; and Boston, Massachusetts, May 30, 1992


6.              Invited speaker on IAQ in Hospitals at the CleanMed 2004 Conference in Philadelphia, PA.  April 14, 2004.


7.              Teacher at Continuing Education Course on IAQ for the Boston Architectural Center in Boston, MA.  April 8, 2004.


8.              Lecturer on Optimizing Ventilation for Commercial Buildings at the Building Energy 2000 and 2001 Conferences of the Northeast Sustainable Energy Association (NESEA). Yale University, New Haven, Connecticut.  March 15-18, 2000 and Tufts University, Medford, Massachusetts.  March 21-24, 2001.


9.              Panelist of the BSA/IAQ Workshop at Build Boston on “IAQ:  A Challenge for Design Teams, Contractors, and Building Owners & Managers”.  November 18, 1998, November 19, 1997, November 20, 1996, and November 14, 1995.


10.           Teacher at Indoor Environments course at the Harvard School of Public Health, three sessions:  March 31, April 3, and April 14, 1997, on IAQ and HVAC Systems.


11.           Presenter at the ASTM IAQ Conference at Johnson State College on "Improving Indoor Air Quality through the use of Continuous, Multi-point Monitoring of Carbon Dioxide and Dew Point.”  Johnson, Vermont.  July 8, 1996.


12.           Lecturer on Commercial Building IAQ Control.  Harvard School of Public Health.  Boston, Massachusetts.  December 1992, December 1991, September 1990, September 1989, September 1988, September 1987, and September 1983.







1.              Bearg, D.W., “Measuring IAQ Parameters” in HPAC Engineering.  August 2008.  Volume 80, Number 8.


2.              Bearg, D.W., "HVAC Systems" in INDOOR AIR QUALITY HANDBOOK, J.D. Spengler, J.M. Samet, & J.F. McCarthy Eds. (McGraw-Hill, 2000), Chap. 7. 


3.              Bearg, D.W. “Improving Indoor Air Quality Through the Use of Continual Multi-point Monitoring of Carbon Dioxide and Dew Point” AIHA Journal 59:636-641 September 1998.


4.              Turner, W.A. Bearg, D.W., and Brennan, T.,  "Ventilation" in Occupational Medicine:  State of the Air Reviews, Vol. 10, No. 1, January-March 1995, Effects of the Indoor Environment on Health, James Seltzer, MD, Editor. (Philadelphia, Hanley & Belfus, Inc. 1995), Chapter 3.  pp 41-57.


4.         Bearg, D.W., "INDOOR AIR QUALITY and HVAC SYSTEMS", Lewis Publishers.        220 pages. 1993.                                     


            5.         McCarthy, J.F., Bearg, D.W., Spengler, J.D., "Assessment of Indoor Air Quality" in INDOOR AIR POLLUTION: A Health Perspective, J.M. Samet, & J.D. Spengler, Eds. (The Johns Hopkins University Press, 1991), Chap. 4. 





1.              Bearg, D.W.  Monitoring for Ventilation and Airtightness.  Presented at the       ASHRAE Winter Meeting, Dallas, Texas, February 6 –9, 2000.  ASHRAE Transactions 2000, V. 106, Pt. 1.


2.              Bearg, D.W. Air Sampling Using a Shared-Sensor, Vacuum-Draw Approach.  Presented at the ASHRAE Annual Meeting, Seattle, Washington,

June 19-23, 1999.  ASHRAE Transactions 1999, V. 105, Pt. 2.


3.              Bearg, D.W.  The Use of Multi-point Monitoring as a Tool for Commissioning

           Buildings for IAQ.  Presented at the ASHRAE Annual Meeting, Chicago, Illinois,

           January 23 –27, 1999.  ASHRAE Transactions 1999, V. 105, Pt. 1.


4.              Bearg, D.W.  Monitoring Ventilation Performance. Presented at IAQ and Energy '98,         

            New Orleans, Louisiana, October 24 - 27, 1998, pp 139-146.


5.              Bearg, D. W.  Commissioning and Indoor Air Quality.  Presented at the 6th National

Conference on Building Commissioning. Coronado Springs Conference Center, Orlando, Florida, May 18-20, 1998.


6.              Bearg, D.W.  Improved Building Operation Through the Use of Continuous, Multi-  

           Point Monitoring of Carbon Dioxide and Dew Point.  Demand Controlled Ventilation 

           for IAQ Session of Environmental Technology Exposition.  The Association of 

           Energy Engineers.  Atlanta, Georgia, November 8-10, 1995


            7.        Bearg, D.W., Turner, W.A. and Brennan, T.,  Errors Associated with the Use of 

                 Carbon Dioxide as a Surrogate for Outdoor Air Supply in Buildings, Presented at the 

           6th International Conference on Indoor Air Quality and Climate, Helsinki, Finland, 

            July 4 - 8, 1993, pp 581-586.


8.         Prezant, B., Bearg, D.W. and Turner, W.A.,  Tailoring Lease Specifications, Proposals, and Work Letter Agreements to Maximize Indoor Air Quality Presented at The Fifth International Conference on Indoor Air Quality and Climate, Toronto, Canada. July 29 - August 3, 1990.


9.         Turner, W.A. and Bearg, D.W., Determining Delivered Quantities of Outdoor Air:  CO2,  Tracer Gas, or Both?  ASHRAE IAQ 1989 in San Diego, Calif., May 1989.