For more information about National Park Service air resources, please visit http://www.nature.nps.gov/air/.


Yosemite National Park

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Ozone (O3) at Turtleback Dome Monitoring Site
updated 04/26/2015 03:00 AM ST

O3 concentration Current Today's
Maximum
Yesterday's
Maximum
8-hour average 39 ppb 42 ppb   46 ppb  
1-hour average 35 ppb 36 ppb   48 ppb  

*Ozone (O3) is measured in parts per billion (ppb)



AQI Ozone


Particulate Matter (PM2.5) at Yosemite Valley Visitor Center
updated 04/26/2015 05:00 AM ST

PM2.5 concentration
Current Today's
Maximum
Yesterday's
Maximum
24-hour average 10.9 μg/m3 7.6 μg/m3
1-hour average 5.0 μg/m3 37.0 μg/m3  28.0 μg/m3

*Particulate Matter (PM2.5) is measured in micrograms per cubic meter (μg/m3)



Particulate Matter (PM2.5)


Weather at Turtleback Dome Monitoring Site

Current temperature  37 F 
Yesterday's minimum temperature  32 F 
Yesterday's maximum temperature  42 F 
Current relative humidity  76 % 
Yesterday's minimum relative humidity  55 % 
Yesterday's maximum relative humidity  94 % 
Current wind speed  11 mph  
Current wind direction  NE 
Precipitation in last hour  0.00 in. 
Precipitation since midnight  0.00 in. 
Yesterday's precipitation  1.14 in. 

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Current Air Quality »
Ozone - O3
updated 04/26/2015 03:00 AM ST
Ozone concentration is ***O3*** parts per billion air quality index (AQI) for Ozone and Particulate Matter from good to unhealthy PM 2.5 is 5.0 micrograms per cubic meter
Particulate Matter - PM2.5
updated 04/26/2015 05:00 AM ST
  • See more air data »
  • Current Weather »

    Temperature
    37 F

    Humidity
    76 %

    Wind
    NE-11 mph

    Precipitation - 1 hr
    0 in.

  • See more weather data »
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    Last Updated: April 26, 2015