To know when to put on protection and when not, there is an app, that tells you how dangerous the air actually is that you are breathing. Surprisingly Beijing´s air is alright today. That´s due to the fact that there is a national holiday today and China´s Communist Party wants the workers to celebrate as well. So they turned off most of the factories surrounding Beijing. Quickly the air dropped to a nice blue number. No danger to breathe in – and out. Enjoy!