This is a great one. Try Prana Air PM2.5 pocket monitor, the smallest, affordable & portable monitor that can tell you the real-time air quality index.
https://www.pranaair.com/air-quality-monitor/handheld/pocket-monitor/
Level of PM10 and PM2.5 in Delhi suspended at the air touched 15–20 times previously mentioned their vulnerability limit at 17 out of 26 air quality observation stations of the Delhi Pollution Control Committee (DPCC) Tuesday early, as humidity and very low night time temperature caused”multiplication” of pollutants. The remaining…