. 2015 Oct 26;124(6):805–812. doi: 10.1289/ehp.1510037

Table 2.

Average indoor environmental conditions simulated in each room of the TIEQ lab.

Variable	Day 1 Green+		Day 2 Moderate CO₂		Day 3 High CO₂		Day 4 Green		Day 5 Conventional		Day 6 Green+
Date	4 November		5 November		6 November		11 November		12 November		13 November
Day of the week	Tuesday		Wednesday		Thursday		Tuesday		Wednesday		Thursday
Room	502	503	502	503	502	503	502	503	502	503	502	503
Experimental parameters
CO₂ (ppm)	563	609	906	962	1,400	1,420	761^b	726^b	969	921	486	488
Outdoor air ventilation (cfm/person)^a	40	40	40	40	40	40	20	20	20	20	40	40
TVOCs (μg/m³)	43.4	38.5	38.2	28.6	32.2	29.8	48.5	43.5	506	666	55.8	14.9
Other environmental parameters
Temperature (°C)	23.9	24.5	22.4	23.9	21.3	22.0	22.9	23.7	21.8	22.5	20.7	21.3
Relative humidity (%)	31.0	30.4	34.2	31.6	38.7	38.3	34.3	33.3	39.6	38.3	27.8	26.8
NO₂ (μg/m³)	57.9	58.9	53.2	54.1	60.8	58.4	51.3	45.6	54.6	50.8	56.5	55.5
O₃ (μg/m³)	3.42	21.2	14.4	13.0	1.37	0.00	6.85	238	1.71	1.37	4.11	6.85
PM_2.5 (μg/m³)	2.38	3.49	3.35	2.58	2.97	2.42	1.26	1.83	1.68	1.34	1.26	1.38
Noise (dB)	51.3	49.9	49.7	48.8	52.5	48.8	49.6	48.7	51.1	48.8	50.5	49.2
Illuminance (mV)	2.95	2.70	2.89	2.83	2.31	2.04	3.11	2.93	2.74	2.51	2.39	2.28
Irradiance (mV)	9.07	8.76	9.45	9.37	6.00	6.05	9.90	9.60	8.30	8.14	6.70	6.82
Abbreviations: TIEQ, Total Indoor Environmental Quality; TVOCs, total volatile organic compounds. ^aA constant air flow rate of 40 cfm/person was maintained on all study days, with 100% outdoor air used on days 1, 2, 3, and 6 and 50% outdoor air and 50% recirculated air used to achieve an outdoor air ventilation rate of 20 cfm/person on days 4 and 5. ^bAverage concentration from 1400 to 1700 hours was 926 ppm, but lower CO₂ concentrations in the morning hours during the approach to steady state led to a lower average CO₂ concentration.