I must admit I'm definitely not the target for such an app. Definitely a lovely concept with a wonderful execution but I still think that apps this small make more sense as webapps rather than full fledged downloadable applications. That being said, if you are the kind of person that actually likes having even the smallest piece of functionality as a standalone app then this is definitely worth a download and a use.
PROS:
- beautiful straightforward design
- simple to understand
- fun to share with friends
CONS:
- virtually none other than not really warranting its existence as a standalone app
IDEAS:
- Since we're talking about an app, it would be great to actually take advantage of some of its main characteristics such as push notifications when the air quality changes or everyday in the morning.
Hopefully I didn't sound too critical, I like the app a lot and I look forward to what you guys are going to do to improve it even further :)