Lifehacker – “…You have plenty of options for finding the Air Quality Index for any particular location. Established weather services like Weather.com should have that number for any location you want. I’ve always been a fan of the Environmental Protection Agency’s PurpleAir, specifically, which gives you a lovely, large map full of dots to show how well you’ll be able to breathe today. You can switch between all kinds of different measurements, including the plain ol’ temperature, as well as different views (normal, satellite, topographic, and dark) and measurement averages (ranging from 10 minutes to a week, as well as real-time data)…”