SmogBar is described as 'An awesome, little Mac menubar app for checking out air quality near you!'. There are six alternatives to SmogBar for a variety of platforms, including Android, iPhone, Android Tablet, iPad and Mac. The best alternative is BreezoMeter, which is free. Other great apps like SmogBar are Air Matters (Free), AQI (Free), Air app (Free, Open Source) and Prkruti (Free).
Prkruti air quality app gives you the real-time air quality tracking by the standard AQI format with the unique colour code. Prkruti smart algorithm notify when to wear mask, when to perform outdoor activity. App helps to identify the pureness of the air.