Fig. 4
From: Carbon dioxide increases with face masks but remains below short-term NIOSH limits

Continuous CO2 levels over time for 1 individual with 15 min of data for each group. NIOSH exposure limit thresholds added for reference
From: Carbon dioxide increases with face masks but remains below short-term NIOSH limits
Continuous CO2 levels over time for 1 individual with 15 min of data for each group. NIOSH exposure limit thresholds added for reference