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24-hr PSI: 26-38; 3-hr PSI: 15                at 10pm on 22 Dec 14

PSI

24-hr PSI is updated at 8am, 12 noon and 4pm daily.

PSI Value Air Quality Descriptor
0 - 50 Good
51 - 100 Moderate
101 - 200 Unhealthy
201 - 300 Very Unhealthy
Above 300 Hazardous

PM2.5 refers to fine particulate matter of 2.5 µm or less in aerodynamic diameter.

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