If the air quality is measured at 406, and 150 is “unhealthy”, 300 is “hazardous”, WTF is 406?
-
Subscribe
Subscribed
Already have a WordPress.com account? Log in now.
If the air quality is measured at 406, and 150 is “unhealthy”, 300 is “hazardous”, WTF is 406?
Wellbredred and Littlebeast 