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


National Mall & Memorial Parks

  • View from the Netherlands Carillon
    Looking East
  • Air Data
    & Weather
  • NPS Air
    Webcams
Visual Range is about 144 miles •
View from the Netherlands Carillon Looking East
Ozone (O3) at McMillan NCORE Monitoring Site 
updated 04/27/2015 11:00 AM ST

O3 concentration Current Today's
Maximum
Yesterday's
Maximum
8-hour average 27 ppb 27 ppb   44 ppb  
1-hour average 37 ppb 37 ppb   47 ppb  

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



AQI Ozone

*The McMillan NCORE monitoring site is operated by the
District of Columbia Department of the Environment.




Particulate Matter (PM2.5) at McMillan NCORE Monitoring Site 
updated 04/27/2015 11:00 AM ST

PM2.5 concentration
Current Today's
Maximum
Yesterday's
Maximum
24-hour average 4.2 μg/m3 6.5 μg/m3
1-hour average 4.0 μg/m3 9.0 μg/m3  16.0 μg/m3

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



Particulate Matter (PM2.5)

*The McMillan NCORE monitoring site is operated by the
District of Columbia Department of the Environment.




Weather at NPS Park Police Headquarters Monitoring Site  updated 04/27/2015 11:00 AM ST

Current temperature  61 F 
Yesterday's minimum temperature  46 F 
Yesterday's maximum temperature  69 F 
Current relative humidity  39 % 
Yesterday's minimum relative humidity  24 % 
Yesterday's maximum relative humidity  88 % 


Visibility at NPS Park Police Headquarters Monitoring Site
updated 04/27/2015 11:00 AM ST

Approximate Visual Range
Current Yesterday's
Maximum
Yesterday's
Minimum
  144 miles 226 miles 17 miles


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Current Air Quality »
at McMillan NCORE
Ozone - O3
updated 04/27/2015 11:00 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 4.0 micrograms per cubic meter
Particulate Matter - PM2.5
updated 04/27/2015 11:00 AM ST

at Park Police Headquarters
Visual Range
144 miles

updated 04/27/2015 11:00 AM ST
  • See more air data »
  • Current Weather »
    at Park Police Headquarters
    updated 04/27/2015 11:00 AM ST
    Temperature
    61 F

    Humidity
    39 %

    Wind
    WNW-6 mph

  • See more weather data »
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    Last Updated: April 27, 2015