ASHRAE Journal - May 2022 - 51
COLUMN IEQ APPLICATIONS
Indoor CO2 has been discussed in the context of building
ventilation and IAQ for literally centuries. More
recent work has focused on two areas: how CO2 concentrations
relate to occupant perception of human bioeffl
uents and other aspects of IAQ, and the use of CO2 to
evaluate outdoor air ventilation rates. While a great deal
of research on these topics has been conducted over the
past several decades, misinterpretation of CO2 as an
indicator of IAQ and ventilation still occurs in the HVAC
industry, IAQ research community and the public. Many
efforts have been undertaken to address this confusion
in standards and guidance documents, technical publications,
conference presentations and workshops, but
signifi cant misunderstanding remains and motivated
the development of this position document.
In addition to the need to clarify the relationship of
indoor CO2 to IAQ and ventilation, other motivations for
this position document include recent research results
on the impacts of CO2 on human cognitive performance
at commonly observed indoor concentrations that were
previously thought not to be of concern. Other recent
studies have examined physiological impacts at these
lower concentrations, distinct from, though perhaps
related to, cognitive and performance effects.
Given trends of increasing outdoor CO2 concentrations,
additional concerns have been expressed regarding
these potential health and performance impacts of
CO2 concentrations in non-industrial indoor environments.
Moreover, a variety of organizations and government
bodies have issued standards and regulations
for indoor CO2 concentrations in non-industrial workplaces,
and CO2 sensors have become less expensive and
more widely deployed.
Concerns have long existed regarding the accuracy of
indoor CO2 concentration measurements, and they are
increasing with the availability and more widespread
application of CO2 sensors. These concerns also include
sensor locations that refl ect air distribution within a
space and occupant location. Indoor CO2 monitoring
has also been promoted as a ventilation indicator in the
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ASHRAE Journal - May 2022
Table of Contents for the Digital Edition of ASHRAE Journal - May 2022
Contents
ASHRAE Journal - May 2022 - Intro
ASHRAE Journal - May 2022 - Cover1
ASHRAE Journal - May 2022 - Cover2
ASHRAE Journal - May 2022 - 1
ASHRAE Journal - May 2022 - Contents
ASHRAE Journal - May 2022 - 3
ASHRAE Journal - May 2022 - 4
ASHRAE Journal - May 2022 - 5
ASHRAE Journal - May 2022 - 6
ASHRAE Journal - May 2022 - 7
ASHRAE Journal - May 2022 - 8
ASHRAE Journal - May 2022 - 9
ASHRAE Journal - May 2022 - 10
ASHRAE Journal - May 2022 - 11
ASHRAE Journal - May 2022 - 12
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ASHRAE Journal - May 2022 - 14
ASHRAE Journal - May 2022 - 15
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ASHRAE Journal - May 2022 - Cover3
ASHRAE Journal - May 2022 - Cover4
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