[PSI] 151–200 [General Health Effects] Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects. To stay indoors. [Descriptor] 
Unhealthy
G o o d
M o d e r a t e
U n h e a l t h y f o r s e n s i t i v e g r o u p s
U n h e a l t h y
V e r y u n h e a l t h y
H a z a r d o u s