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Good: 0–50
Moderate: 51–100
USG: 101–150
Unhealthy: 151–200
Very Unhealthy: 201–311
Hazardous: 301 and above

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Last modified on December 21st, 2017
Posted on April 21st, 2017