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AIR QUALITY INDEX

Mariposa County Smoke Related Air Quality Index (AQI)

Smoke from the Ferguson Fire is impacting the Mariposa County Air Pollution Control District. Smoke Levels are still in the unhealthy range in some areas. Some areas will see continued smokey conditions throughout the day.  Your current local conditions could vary. 

LAST UPDATED: AUG 19, 2018 @ 8:35am

PERSONS WITH HEALTH CONDITIONS THAT ARE AFFECTED BY SMOKE SHOULD CONSIDER RELOCATING TO A SMOKE FREE AREA WHEN SMOKE IS PRESENT

Recommendations for Schools & Others Responsible for Children during a Wildfire Smoke Event

CURRENTLY ALL AREAS OF MARIPOSA COUNTY ARE BEING IMPACTED BY SMOKE. THE AREAS LISTED BELOW ARE WHERE ACTUAL MONITORS HAVE BEEN PLACED. IF YOU LIVE IN AN AREA WITHOUT A MONITOR USE THE CLOSEST MONITOR TO YOUR LOCATION

 LOCATION  STATUS AT UPDATE
    EXPECTED LATER TODAY         
MARIPOSA MODERATE*
GOOD in the late afternoon
CATHEYS VALLEY GOOD  MODERATE
Ponderosa Basin   GOOD* GOOD 
 BOOTJACK   GOOD* GOOD 
 Greeley Hill GOOD* MODERATE early afternoon returning to Good
Coulterville  GOOD*
MODERATE EARLY AFTERNOON RETURNING TO GOOD
Midpines GOOD*   GOOD
YOSEMITE VALLEY    GOOD MODERATE  in the afternoon
 El Portal     UNHEALTHY for Sensitive Groups* MODERATE with brief periods of GOOD IN THE AFTERNOON
 WAWONA GOOD   GOOD
OAKHURST GOOD*  GOOD

*See Chart Below for recommendations
Resource: How to Build an Inexpensive Room Filter
Resource:  California Smoke information

For additional information on wildfire smoke and air quality visit: 
AirNow website at
AirNow Fires: Current Conditions
US Forest Service AirFire website at:
Airfire.org/MariposaCountyArea
For either of these sites you can scroll in on the map to Mariposa. 
The triangles are monitoring sites. Their color is tied to the AQI levels below.


AQI Defined.jpg

  • Download our Wildfire Health Smoke Tips!
  • Use common sense. If it looks smoky outside it’s probably not a good time to go for a run. And it’s probably not a good time for your children to play outdoors.
  • If you have a heart or lung disease, if you are an older adult, or if you have children, talk with your doctor about whether, and when, you should leave the area.
  • If you decide to remain:
    • Consider staying indoors to avoid breathing the smoke particles.
    • Run your air conditioner, if you have one.
    • Keep the fresh air intake closed, and the filters clean, to prevent bringing additional smoke inside. Note: if you don’t have an air conditioner, staying inside with the windows closed may be dangerous in extremely hot weather. In these cases, seek alternative shelters.
    • A swamp cooler will not provide this protection, and will pull in the smoky air from outside.
  • Masks vs.  Respirators:  Most dust masks, surgical masks, and bandanas DO NOT protect you from wildfire smoke. They just aren’t designed to filter the very small particles, or fit well enough to provide an airtight seal around the mouth and nose.

    Respirator masks can be effective in reducing exposure to smoke particles, however they should only be used after first implementing other, more effective methods of exposure reduction, including staying indoors with doors and windows closed, reducing activity, and using HEPA air cleaners indoors to reduce overall smoke exposure.

    The EPA offers more information on N95 respirators and protecting you and your family from wildfire smoke

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PO Box 784 | 5100 Bullion St. | Mariposa, CA 95338