> sorry, my exhalations are not "pollution"
Try breathing in a bag.
Air is 21% oxygen. On average, a resting adult breathes in about 250ml of oxygen per minute.
Air is about about 0.04%. The average adult expels approximately 200ml to 250ml of carbon dioxide per minute. Roughly the same as the o then they intake.
So the relative percentage of C02 increases extremely rapidly in any small volume of air, compared to relative reduction in oxygen.
Up to 0.5% (5,000 parts per million): Considered safe for prolonged exposure, this level is typically used as an occupational exposure limit.
1% to 2%: Can cause drowsiness and poor air quality perception.
3%: May lead to impaired hearing, headache, and increased blood pressure and pulse rate.
5% and above: Can lead to shortness of breath, dizziness, confusion, and even loss of consciousness. Exposure at this concentration for several hours can be dangerous to human health.
Above 8%: Can be fatal.
More? Once someone expires, the percentages reach an unwanted steady state!
Even in a tightly closed building, CO2 buildup can impact cognition.
And build up in the atmosphere impacts the heat balance of the planet.
Your exhalations are only pollution when they destabilize healthy levels. So that’s a bit of a straw man concern.
Breathing (outside of plastic bags, and unventilated buildings): fits within normal planetary balance of C02. Not a concern as a pollutant.
Continuously burning billions of tons C02 generating chemicals for decades, another matter.