Exposure to polluted air is like smoking a pack a day, study says CNNLong-term air pollution exposure could explain emphysema in non-smokers The WeekEven Low Levels of Air Pollution Can Damage Your Lungs as Much as Smoking a Pack a Day GizmodoAir pollution in cities as bad for lungs as smoking 20 cigarettes a day, study says New York Post Living in cities is as bad as smoking 20 cigarettes a day Metro.co.ukView full coverage on Google News