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Data S1. Additional details on the UV-APS calibration and data processing.

Data S2. Particle and carbon dioxide emissions during exams.

Table S1. UV-APS observational monitoring sampling schedule.

Table S2. UV-APS instrument statistics shown for each of 51 particle size channels, before and after calibration.

Table S3. Calibration adjustment factors for optical particle counters.

Table S4. Lumped UV-APS particle size groups.

Table S5. The indoor concentration of outdoor particles (×10−4 cm−3) modeled for each weeklong occupied observational sampling period, as a function of particle size.

Table S6. Summary data on mean, 8-h daily (9:00–17:00) levels of parameters sampled during indoor-occupied and indoor-unoccupied monitoring periods.

Figure S1. (a) UV-APS size calibration curve. (b) A comparison of average particle number concentrations evaluated with the UV-APS and the APS, during a test (1.5 h) during which the two instruments were co-located in a carpeted office while a single occupant walked about in the room.

Figure S2. The average number distribution of particles sampled in the classroom during the monitoring period Occ3 (9/3 at 14:15 to 9/8 at 10:30) displayed as a function of fluorescence intensity and particle aerodynamic diameter.

Figure S3. Mean ratios of indoor/outdoor total particle number concentrations (1-min measurements collected during 9:00–17:00 on each sampled day) measured with optical particle counters (OPCs) during Unocc1.

Figure S4. Summary of deposition loss rate coefficients (k) as a function of particle aerodynamic diameter (da).

Figure S5. Illustrative time series figures expanded to include periods (a) before the mechanical ventilation system was turned on at 8:00, and (b) after it was turned off around 20:45.

Figure S6. Daily, 8-h (9:00–17:00) means, showing the change in number concentrations of all particles (NT) across days, and comparing indoor-occupied (18 days), indoor-unoccupied (8 days), and outdoor (9 days) conditions.

Figure S7. Size distributions of daily (9:00–17:00) mean FBAP to total number concentration ratios (NF/NT, upper panels), and highly fluorescent to fluorescent particle number concentration ratios (NF20/NF, lower panels), measured during (left) occupied conditions and (right) unoccupied conditions.

Figure S8. A comparison between size distributions of the ratio of highly fluorescent to total fluorescent (NF20/NF) particle emissions estimated for transition events (= 24), and for an outlier episode that was not included in the means reported in this paper.

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