National Park Service

Air Resources






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

NPS » Explore Nature » Air Resources

National Mall & Memorial Parks

  • View from the Netherlands Carillon
    Looking East
  • Air Data
    & Weather
  • NPS Air
    Webcams
Visual Range is about 75 miles • updated 02/09/2012 11:00 AM EST
View from the Netherlands Carillon Looking East
Ozone (O3) at McMillan Reservoir Monitoring Site 
updated 02/09/2012 11:00 AM EST

O3 concentration Current Today's
Maximum		 Yesterday's
Maximum
8-hour average unavailable unavailable  16 ppb  
1-hour average 0 ppb 1 ppb   17 ppb  

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



AQI Ozone

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




Particulate Matter (PM2.5) at McMillan Reservoir Monitoring Site 
updated 02/09/2012 11:00 AM EST

PM2.5 concentration
Current Today's
Maximum		 Yesterday's
Maximum
24-hour average 14.7 μg/m3 — 16.3 μg/m3
1-hour average 18.0 μg/m3 21.6 μg/m3  22.5 μg/m3

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



Particulate Matter (PM2.5)

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




Weather at NPS Park Police Headquarters Monitoring Site  updated 02/09/2012 11:00 AM EST

Current temperature  40 F 
Yesterday's minimum temperature  39 F 
Yesterday's maximum temperature  46 F 
Current relative humidity  48 % 
Yesterday's minimum relative humidity  57 % 
Yesterday's maximum relative humidity  90 % 


Visibility at NPS Park Police Headquarters Monitoring Site
updated 02/09/2012 11:00 AM EST

Approximate Visual Range
 Current Yesterday's
Maximum		 Yesterday's
Minimum
  75 miles 56 miles 15 miles


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Current Air Quality »
at McMillan Reservoir
Ozone - O3
updated 02/09/2012 11:00 AM EST
Ozone concentration is ***O3*** parts per billion air quality index (AQI) for Ozone and Particulate Matter from good to unhealthy PM 2.5 is 18.0 micrograms per cubic meter
Particulate Matter - PM2.5
updated 02/09/2012 11:00 AM EST

at Park Police Headquarters
Visual Range
75 miles

updated 02/09/2012 11:00 AM EST
  • See more air data »
    • Current Weather »
    at Park Police Headquarters
    updated 02/09/2012 11:00 AM EST
    Temperature
    40 F

    Humidity
    48 %

    Wind
    NNW-7 mph

  • See more weather data »
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    Last Updated: February 09, 2012