4 ms·
Currently CO2 concentration in the air is about 0.04 percent. Levels above 0.5 percent may be harmful in the long-term. Levels above 7 percent can cause suffo
by mr_toad 3y ago
Currently CO2 concentration in the air is about 0.04 percent. Levels above 0.5 percent may be harmful in the long-term. Levels above 7 percent can cause suffocation.