Yes, 丰城市环境空气质量 is completely free and it doesn't have any in-app purchases or subscriptions.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
丰城市环境空气质量 is free.
To get estimated revenue of 丰城市环境空气质量 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.