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Steven Welty


CIE (Certified Indoor Air Environmentalist)

CAFS (Certified Air Filtration Specialist)

LEED® AP (U.S. Green Building Accredited Professional)

As an expert in understanding and preventing airborne infectious diseases,
Steve creates airborne infection/mold control systems utilizing high- output ultraviolet light, advanced germ trapping air filters and fresh air/positive-pressurization HVAC systems.


  • designs top secret bioterrorism air purification systems for the Federal Government. Steve designed, specified and supervised the installation of the airborne bioterrorism protection system within the most secure building in Washington, DC.

  • uses his expertise as an airborne infectious disease investigator to engineer HVAC systems in order to prevent airborne germs and mold from infecting humans in office buildings, schools, hospitals and homes.

  • is a contributing and named author to:

    • ASHRAE IAQ "Guideline 24"

    • AIHA "Guideline for Selection and use of Environmental Surface Disinfectants in Healthcare"

    • AIHA Guideline "Role of the industrial Hygienist in a Pandemic"

    • The 2023 "IAQA Standard for the Inspection of an Educational Facility for Moisture Intrusion and Mold Growth”


  • has authored many published scientific articles

  • has briefed US Federal Agencies on the relationship between "airborne influenza, humidity and flu season” in 2009 & 2013 at the EPA in Washington, DC.

In 2007, Steve was the Founding chairman and is a contributing author to the first School mold, moisture & Indoor Air Quality (IAQ) Standard: “The IAQA Standard for the Inspection of an Educational Facility for Moisture Intrusion and Mold Growth”.  It has undergone two public reviews and has now been published in 2023.

Extensively lectured on and authored articles on airborne infectious diseases, HVAC energy efficiency, indoor air quality & air filtration.

At EPA Headquarters in Washington ,DC, briefed all Federal agencies on how low indoor humidity in the wintertime increases infectious airborne influenza which then causes “flu season”. This is why COVID infections have exponentially increased in the winters of 2019-2021


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