Re: air quality, my understanding is the EPA has a badass network of air quality sensors. Here's one project that maps them and the data streaming off of them (

Re: air quality, my understanding is the EPA has a badass network of air quality sensors. Here's one project that maps them and the data streaming off of them (example shows a sensor in SF): http://aqicn.org/city/california/san-francisco/san-francisco-arkansas-street/ http://aqicn.org/city/california/san-francisco/san-francisco...