Time-Resolved Characterization of Indoor Air Quality due to Human Activity and Likely Outdoor Sources during Early Evening Secondary School Wrestling Matches

Figure 3

Respirable or coarse particulate matter (PM₁₀) count-to-estimated concentrations, mg m⁻³, for match #2 on 1/30/2019. Each team had ∼25 student-athletes and ∼5 coaches/staff (including the certified athletic trainers) present. Notes: values to the right of peaks above were the highest measured values (off y-axis). Junior varsity match finished ∼17 : 40, varsity warm-up exercises on mats to ∼18 : 00, then match (individual bouts) started ∼18 : 00 and ended ∼19 : 24, and student-athletes and coaches clean-up/roll mats ∼19 : 24–19 : 29 (data loggers stopped by 19 : 30 on study days).