Bad Air Days in Alpine County, California
Not enough data
EPA monitors in Alpine County ran on too few days between 2016 and 2025 to give a fair yearly count (about 7% of days covered). Neighbouring counties below are a better guide.
What actually helps here
- EPA monitors here ran too few days to give a fair yearly count. Use AirNow for today's air.
The record for Alpine
| Date | AQI | Main pollutant |
|---|---|---|
| 2016-08-10 | 69 | PM2.5 |
| 2016-08-22 | 58 | PM2.5 |
| 2016-01-07 | 55 | PM2.5 |
| 2016-05-18 | 54 | PM2.5 |
| 2016-08-16 | 54 | PM2.5 |
An ordinary day in Alpine
Across 24 monitored days from 2016 to 2016, the air in Alpine County rated Good on 79% of them, more often than the 72% typical of monitored counties, and Moderate on 21%. The median day sat at AQI 29; one day in ten went above 55.
The pollutant setting the AQI on an ordinary day here:
- fine particles (PM2.5)100%24 days
Every recent year on file
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2016 | 24 | 19 | 5 | 0 | 0 | 29 | 69 |
| 2015 | 31 | 1 | 14 | 16 | 3 | 102 | 177 |
| 2014 | 50 | 45 | 5 | 0 | 0 | 31 | 83 |
| 2013 | 32 | 18 | 7 | 7 | 7 | 47 | 270 |
| 2012 | 24 | 13 | 10 | 1 | 0 | 50 | 111 |
| 2011 | 7 | 2 | 5 | 0 | 0 | 53 | 62 |
California compared
- San Bernardino County138/yr
- Riverside County132/yr
- Kern County109/yr
- Tulare County107/yr
- Los Angeles County106/yr
- Fresno County81/yr
- Kings County49/yr
- Imperial County40/yr
How this is counted
A bad air day is a day the county's daily AQI from EPA AirData went above 100, the level where EPA tells children, older adults and people with asthma or heart disease to cut back outdoors. Monitors do not run every day, so yearly counts are scaled to 365 days. This is the record, not today's air: for that, check AirNow. More on the method in how the county numbers are made, on the AQI 100 line in what counts as a bad air day.