Well, if you are outside in a Chinese industrial area then just open your eyes or mouth. Same with Los Angeles, though apparently smog makes for beautiful sunsets. I kid because I care China. In all seriousness, there are several options to test the air available outside of your five senses. Individual test kits are available of varying expense and complexity. The second link discusses a vest being used in Detroit, Michigan to monitor the effects of air pollution with heart troubles. When in doubt trust your eyes and nose.
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