ASHRAE Journal - February 2023 - 24
IEQ APPLICATIONS
Column
Benjamin Jones
A Proposed Harm-Based IAQ Procedure for Standard 62.2
Dallying with DALYs
DR. BENJAMIN JONES, DR.ENG.
The ASHRAE Standing Standard Project Committee on Ventilation and Acceptable
Indoor Air Quality in Residential Buildings (62.2) has embarked on a ground-breaking
endeavor-it put forth a potential addendum to the standard that would add a harmbased
indoor air quality procedure as an alternative compliance method.
The Standard 62.2 committee has used existing
research to determine that its IAQ Procedure needs to
consider only three contaminants, and only the sum
of the harm from those three contaminants needs to
be limited. Details of the proposal can be found in the
Advisory Public Review,* but the concept has broad
implications.
Harm-Based vs. Level-Based Metrics of IAQ
An airborne contaminant is a substance not normally
present in the air. Some contaminants are emitted
internally by building materials and furnishings and by
occupants and their activities. Other contaminants are
brought inside by ventilation and infiltration. A person
is exposed to airborne contaminants when they occupy
the same space as contaminated air, and their exposure
is a function of the concentration and the time spent in
the space. The dose received is a function of breathing
rate, breathe volume and uptake by the lungs. These
factors are affected by metabolic rate and physiology
that may be a function of age and sex.
The response to the dose is considered here to act over
a lifetime when they are known as chronic responses.
The harm may lead to illness, disability and/or premature
death. None of these parameters are constants, so
the dose received in different spaces and for different
occupancy scenarios will also be different. Therefore,
an air quality metric should identify when the quality
of indoor air is unacceptable and should be based on its
effects on human health and comfort, acknowledging
that they may not be immediate.1
Occupant perception of indoor air is a basis of most
ventilation standards and is used to assess indoor
odors and air quality in buildings. The human nose is
as sensitive to some gaseous contaminants as chemical
analyses, and using it indicates occupant preference
and ensures that people are the focus of an assessment.
Its subjectivity, the inability of the nose to smell some
harmful contaminants (carbon monoxide is odorless,
for example), its high dependence on temperature and
relative humidity and the propensity of people to adapt
to malodors after only a few minutes are fundamental
concerns. Many standards further increase ventilation
rates to minimize contaminant exposures and, therefore,
protect occupant health.
A second method used to assess indoor odors and
building air quality might be to identify properties of
a building that are known to affect IAQ directly, for
example using a tick-box approach. Each feature could
be weighted according to their hazard and aggregated
to produce a single metric. This method could be used
to develop a third-party rating system, similar to many
The draft of proposed Addendum c to ASHRAE Standard 62.2-2022 will be posted for an advisory public review from Jan. 27 to
March 13 at https://osr.ashrae.org/default.aspx.
24
ASHRAE JOURNAL ashrae.o rg
F E B R U A RY 2023
https://osr.ashrae.org/default.aspx
http://www.ashrae.org
ASHRAE Journal - February 2023
Table of Contents for the Digital Edition of ASHRAE Journal - February 2023
Contents
ASHRAE Journal - February 2023 - Intro
ASHRAE Journal - February 2023 - Cover1
ASHRAE Journal - February 2023 - Cover2
ASHRAE Journal - February 2023 - 1
ASHRAE Journal - February 2023 - Contents
ASHRAE Journal - February 2023 - 3
ASHRAE Journal - February 2023 - 4
ASHRAE Journal - February 2023 - 5
ASHRAE Journal - February 2023 - 6
ASHRAE Journal - February 2023 - 7
ASHRAE Journal - February 2023 - 8
ASHRAE Journal - February 2023 - 9
ASHRAE Journal - February 2023 - 10
ASHRAE Journal - February 2023 - 11
ASHRAE Journal - February 2023 - 12
ASHRAE Journal - February 2023 - 13
ASHRAE Journal - February 2023 - 14
ASHRAE Journal - February 2023 - 15
ASHRAE Journal - February 2023 - 16
ASHRAE Journal - February 2023 - 17
ASHRAE Journal - February 2023 - 18
ASHRAE Journal - February 2023 - 19
ASHRAE Journal - February 2023 - 20
ASHRAE Journal - February 2023 - 21
ASHRAE Journal - February 2023 - 22
ASHRAE Journal - February 2023 - 23
ASHRAE Journal - February 2023 - 24
ASHRAE Journal - February 2023 - 25
ASHRAE Journal - February 2023 - 26
ASHRAE Journal - February 2023 - 27
ASHRAE Journal - February 2023 - 28
ASHRAE Journal - February 2023 - 29
ASHRAE Journal - February 2023 - 30
ASHRAE Journal - February 2023 - 31
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ASHRAE Journal - February 2023 - 72
ASHRAE Journal - February 2023 - Cover3
ASHRAE Journal - February 2023 - Cover4
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