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According to a report into the incident over Lincolnshire, the aircraft departed "with the engine bleed air system off" because the switches had been "incorrectly left off following maintenance activity" the night before.

Fourth, in addition to indoor safety, if you need to drive during smoky conditions, you can switch your car’s air system to recirculate.

The CH-53E is a heavy lift helicopter is used for transporting troops and equipment in roles such as launching amphibious assaults and supply missions, according to the Naval Air System Command website.

Steven Lynn, a former head of the FDA's Office of Manufacturing and Product Quality who is now a regulatory compliance consultant, said the issues found with the factory's air system in sterile areas were "troubling" but that the FDA wouldn't hesitate to act if there was a clear safety threat.

Install a central air system with outdoor air intake.