these are good hints. In addition i heard, to kill bugs , insects etc. on plains they spray insecticides, even when people are inside. The "fresh" air from the outside is warmed up by the turbines, so you inhale the fumes of the burned up kerosene. so only open the "air" valve above Your seat at maximum hight.
When You travel by plane at maximum hight ~10km then you get the radiation equivalent of a breast X-ray every 7 minutes, due to cosmic radioactive radiation.
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so when you stay in the plane longer, you are breathing some dust and bacteria in the air. So no matter we can't get rid of it, one thing you can do is wearing a mask all the time in the flight. For flight attendant, sometimes we need to check the radiation level inside our body especially when we always fly the long haul flights.
may be research (Your s) along the following lines will be of help
https://www.agnihotra-online.com/index.php/de/homa-anwendung/homa-therapie , only partially translated https://www.agnihotra-online.com/index.php/en/