If you patronized a restaurant, hair salon, or grocery store and knew the entire volume of air in those buildings is evacuated every 2-3 minutes, I think that would give many a greater sense of safety. That's what occurs on an aircraft. 50% of that air is then recycled through HEPA filters and re-enters the cabin. How good are HEPA filters in aircraft you ask?
"HEPA or high efficiency particulate air filters have similar performance to those used to keep the air clean in hospital operating rooms and industrial clean rooms. These filters are very effective at trapping microscopic particles as small as bacteria and viruses."
When traveling as a passenger, my advice is to always have the overhead air vent open slightly and blowing on your face to provide fresh air.
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"Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, cigar in one hand, bourbon in the other, body thoroughly used up, totally worn out and screaming "WOO HOO - what a ride!" -- Hunter S. Thompson
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