Air Quality Index

updated 10/21/2020 AT 0855 hrs 

For forecast updates over the weekend please visit


MARIPOSA COUNTY continues to BE IMPACTED BY SMOKE FROM the nearby Creek fire and other FIRES AROUND THE STATE at times.

Creek Fire Forecast info: 

Light winds aloft allowed smoke to spread northward along drainages northwest of the fire yesterday – having a bigger impact on Yosemite than seen on previous days.  Today, expect heavy smoke impacts to foothills, San Joaquin River drainage locations, as well as Mammoth into Bishop. The diurnal upslope-down-valley wind pattern will continue to control smoke movement over the next few days. With high loadings of dead and down fuels, along with prolonged dry conditions, smoke production is high. While the fire is not expected to make any runs or move much in the next few days, we will continue to see a lot of new smoke each day. More seasonal weather is expected later this week, which should dampen fire activity and decrease smoke production.

Persons with health conditions that are affected by smoke should consider relocating to a smoke free area until the smoke levels return to normal.

 NEW smoke forecast link

California Smoke Blog smoke information  

the Monitor now located in Coulterville is showing a similar AQI pattern as the one in Mariposa. The creek fire forecast doesnot show coulterville due to limitations in their current coverage area.

smoke forecast from the creek fire air resource advisor. this is a forecast not a promise. 



Mariposa County Smoke Related Air Quality Index (AQI)  click here to See the AirNow website 

You can view current air quality around Mariposa County by visiting the AirNow website and scrolling in to your part of Mariposa county on the map. You can also view the low tech sensor network of purple air sensors around the county at PurpleAir (website). These sensors are an indicator of air quality status but they are not as accurate as the emergency response monitors we use during a local fire. In side by side comparisons to our High tech monitors they read high, sometimes they are reporting significantly higher than actual conditions.

More Information

Protect yourself and your family with these Wildfire Smoke Health Tips 

For additional information on air quality you can visit the AirNow (website)

AQI Defined
  • 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” (especially surgical masks or wet bandanas) will not protect your lungs. If the smoke is that irritating to you, the best option is to remain indoors or temporarily re-locate.