This app is great. I live in Southern California and am in that group of "highly sensitive individuals" affected by air quality. Fascinating and useful to have data on, for example, which cities are most affected by recent forest fires. The Air Quality Index of mine is 139. No wonder I'm wheezing. Where to go? I check the cities close by. 120s-130s. Check my cousin's city, 40 miles away. AQI only 79. Better! I check the coast. AQI a mere 50! Do I hear a mini-vacation calling?Love the leaf symbols to indicate health points. Green is great, going to green with yellow edge, yellow, yellow with red edge, red. Great visual. A minor annoyance: If you put a lot of cities on your list, it takes a long time to see data on any one of them, and you're blocked from doing anything about it. I'd rather see the current one ASAP, because usually I don't care about the others. Or, I want to be able to access the list of cities so I can just delete some, to have the rest load faster (sometimes I like to look at the cities where my siblings live, just for grins--but not when I'm trying to get local data quickly).