Is it actually smoggy outside today, or is it just you? If you have the Visibility app on your Android smartphone, you can find out. Just take a picture of the sky, and you will receive a message detailing how polluted the air is at your location. Not only will you know if you should take shelter indoors, but you will also be contributing to the scientific understanding of local air pollution.
Read the full article: Experimental smartphone app measures air pollution