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Table 4 Average CO2 differential, air changes per hour and sick leave rates for each intervention period

From: A study of indoor carbon dioxide levels and sick leave among office workers

Period

Building 1

Dates

Outdoor Air Rate

Average ACH1

Average CO2 Differential during day of SF6 test

CO2 Differential (ppm) during period during day of SF6 test

Sick Leave Rate (sick hrs/scheduled hrs)

Jan 2000 – April 2000

High

2.5

107

127

0.0108

April 2000 – June 2000

Low

0.71

213

192

0.0129

July 2000 – Oct 2000

High

2.6

101

82

0.0154

Nov 2000 – March 2001

Low

NA

NA

95

0.0159

March 2001 – May 2001

High

1.3

153

126

0.0118

May 2001 – June 2001

Low

NA

NA

144

0.0068

 

Building 2

Nov 2000 – Dec 2000

Low

NA

NA

111

0.0090

Dec 2000 – Feb 2001

High

1.2

145

120

0.0088

March 2001 – May 2001

Low

NA

NA

142

0.0104

May 2001 – June 2001

High

NA

NA

129

0.0130

  1. 1Average air changes per hour computed from SF6 tracer gas decay