The International Agency for Research on Cancer released a report on the 17th, and for the first time identified that atmospheric pollution is "carcinogenic to humans", and considered it as a general and main environmental carcinogen. The hazard level of atmospheric pollution in terms of causing cancer has been ranked at the same level as tobacco and asbestos etc.. You can choose not to drink or smoke, but you cannot control whether you are exposed to air pollution, and you can't just decide not to breathe.