Porterville Weather 
Air Quality Forecast
Updated: Wednesday, March 10 2010 - 3:20 AM PST
| Day | Primary Pollutant | Air Quality Level | Air Quality Index |
| Wednesday | PM 2.5 | Good |  |
| Thursday | PM 2.5 | Good | |
| Friday | PM 2.5 | Good | |
| Saturday | Ozone | Good | |
| Sunday | PM 2.5 | Good | |
Air Quality Maps
|
Air Quality Index
Levels of Health Concern |
Numerical
Value |
Meaning
|
|---|---|---|
| Good | 0-50 | Air quality is considered satisfactory, and air pollution poses little or no risk. |
| Moderate | 51-100 | Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution. |
|
Unhealthy for Sensitive Groups |
101-150 | Members of sensitive groups may experience health effects. The general public is not likely to be affected. |
| Unhealthy | 151-200 | Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects. |
| Very Unhealthy | 201-300 | Health alert: everyone may experience more serious health effects. |
| Hazardous | > 300 | Health warnings of emergency conditions. The entire population is more likely to be affected. |