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Emergency air/oxygen systems are standard fitting in public transport planes, so is it crazy to suggest marketing/legislating them into public/private/trade vehicles in cities where other means of coping with air-pollution have failed or are failing to reduce health-maintenance costs?
measure of course but the same applies to a related practice - fitting airbags.
[Superficial search done. Found "Goodie" had the germ of the idea for motorbike helmets]