Travel by air: health considerations.
D016902:Air Pollution, Indoor; D000399:Air Pressure; D001359:Aviation; D004196:Disease Outbreaks / Q000517:prevention & control; D004242:Diving; D004780:Environment, Controlled; D006801:Humans; D006813:Humidity; D018570:Risk Assessment; D045169:Severe Acute Respiratory Syndrome / Q000635:transmission; D013315:Stress, Psychological; D014195:Travel; D020246:Venous Thrombosis