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

Figure 4

Respirable or coarse particulate matter (PM₁₀) and fine particulate matter (PM_2.5) count-to-estimated concentrations, mg m⁻³, and suggested impact of student-athlete activities, match #1, 1/23/2019. Each team had ∼25 student-athletes and ∼5 coaches/staff (including the certified athletic trainers) present. Notes: the blue arrows were takedown maneuvers; the green arrows were pins; and the purple arrows were when a takedown maneuver led to a pin. For 1/23/2019, varsity warm-up on mats started ∼17 : 50, then match (individual bouts) started ∼18 : 03 and ended ∼19 : 11; student-athletes and coaches completed clean-up/mats rolled to ∼19 : 20 (data loggers stopped by 19 : 30 on study days).