ASHRAE Journal - September 2019 - 71

COLUMN PRODUCTIVITY-ASHRAE

FIGURE 1 Associations of CO2 concentrations with cognitive performance.

Statistically significant effect (P<0.05)

# No statistically significant dose-response trend

Reduced Percent of Detected Errors in Proofreading Test

12
12
14

Reduced Reading Speed in Proofreading Test

12
12
14

Reduced Decision Making Test (SMS)

13
17
18
20

#
Pilot's Performance from Flight Simulator Data

16

Pilot's Performance Based on Examiner

16

Reduced Cognition Battery Speed

#

20

Cognition Battery Accuracy

#

20

Reduced Cognitive Performance

22

0

500

1,000

1,500

2,000 2,500 3,000 3,500 4,000 4,500
CO2 Concentrations (ppm)

5,000 5,500 14,500 15,000

FIGURE 2 Associations of CO2 concentrations with perceived outcomes.
12
12
14
23
19
18

Statistically significant effect (P<0.05)

Reduced Perceived Air Quality

Increased Fatigue

12
12
14
23
19
18

Increased Sick Building
Syndrome Symptoms)

22

0

500

1,000

1,500

2,000

2,500

adults, often college-age adults, as subjects. One study
employed pilots16,21 as subjects, another employed submarine staff,18 and a third employed staff trained as
astronauts.20 All but one of these studies18 measured
changes in perceptual, health, or performance outcomes
for each subject, with each subject exposed to multiple
CO2 concentrations. This design eliminated the potential errors that may occur when comparing different
groups of subjects. One study18 employed a study design
with three different groups of subjects, each group
exposed to a different level of CO2 in the indoor air.

3,000
3,500
4,000
CO2 Concentrations (ppm)

4,500

5,000

5,500

14,500

15,000

Figures 1, 2 and 3 depict the major results of this body of
research with each horizontal line representing results
from a single study or a part of a study. The circles indicate the CO2 concentrations employed in the study. A
filled in circle indicates a statistically significant (SS)
worsening in the outcome at the indicated CO2 concentration relative to the CO2 concentration denoted by the
leftmost circle. The numbers to the right of each horizontal line indicate the data source.
With respect to subjects' cognitive performance, there
are substantial inconsistencies among the results of
S E P T E M B E R 2 0 19

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ASHRAE Journal - September 2019

Table of Contents for the Digital Edition of ASHRAE Journal - September 2019

Contents
ASHRAE Journal - September 2019 - Intro
ASHRAE Journal - September 2019 - Cover1
ASHRAE Journal - September 2019 - Cover2
ASHRAE Journal - September 2019 - 1
ASHRAE Journal - September 2019 - Contents
ASHRAE Journal - September 2019 - 3
ASHRAE Journal - September 2019 - 4
ASHRAE Journal - September 2019 - 5
ASHRAE Journal - September 2019 - 6
ASHRAE Journal - September 2019 - 7
ASHRAE Journal - September 2019 - 8
ASHRAE Journal - September 2019 - 9
ASHRAE Journal - September 2019 - 10
ASHRAE Journal - September 2019 - 11
ASHRAE Journal - September 2019 - 12
ASHRAE Journal - September 2019 - 13
ASHRAE Journal - September 2019 - 14
ASHRAE Journal - September 2019 - 15
ASHRAE Journal - September 2019 - 16
ASHRAE Journal - September 2019 - 17
ASHRAE Journal - September 2019 - 18
ASHRAE Journal - September 2019 - 19
ASHRAE Journal - September 2019 - 20
ASHRAE Journal - September 2019 - 21
ASHRAE Journal - September 2019 - 22
ASHRAE Journal - September 2019 - 23
ASHRAE Journal - September 2019 - 24
ASHRAE Journal - September 2019 - 25
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ASHRAE Journal - September 2019 - 27
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ASHRAE Journal - September 2019 - 30
ASHRAE Journal - September 2019 - 31
ASHRAE Journal - September 2019 - 32
ASHRAE Journal - September 2019 - 33
ASHRAE Journal - September 2019 - 34
ASHRAE Journal - September 2019 - 35
ASHRAE Journal - September 2019 - 36
ASHRAE Journal - September 2019 - 37
ASHRAE Journal - September 2019 - 38
ASHRAE Journal - September 2019 - 39
ASHRAE Journal - September 2019 - 40
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ASHRAE Journal - September 2019 - 50
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ASHRAE Journal - September 2019 - 54
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ASHRAE Journal - September 2019 - 88
ASHRAE Journal - September 2019 - Cover3
ASHRAE Journal - September 2019 - Cover4
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