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 84 miles • updated 09/20/2014 05:45 PM EDT
View from the Netherlands Carillon Looking East
Ozone (O3) at McMillan NCORE Monitoring Site 
updated 09/20/2014 05:00 PM EDT

O3 concentration Current Today's
Maximum
Yesterday's
Maximum
8-hour average 39 ppb 39 ppb   45 ppb  
1-hour average 53 ppb 53 ppb   54 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 09/20/2014 05:00 PM EDT

PM2.5 concentration
Current Today's
Maximum
Yesterday's
Maximum
24-hour average 10.6 μg/m3 11.8 μg/m3
1-hour average 8.0 μg/m3 15 μg/m3  17 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 09/20/2014 05:00 PM EDT

Current temperature  81 F 
Yesterday's minimum temperature  61 F 
Yesterday's maximum temperature  78 F 
Current relative humidity  52 % 
Yesterday's minimum relative humidity  46 % 
Yesterday's maximum relative humidity  92 % 


Visibility at NPS Park Police Headquarters Monitoring Site
updated 09/20/2014 04:00 PM EDT

Approximate Visual Range
Current Yesterday's
Maximum
Yesterday's
Minimum
  84 miles 74 miles 12 miles


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Current Air Quality »
at McMillan NCORE
Ozone - O3
updated 09/20/2014 05:00 PM EDT
Ozone concentration is ***O3*** parts per billion air quality index (AQI) for Ozone and Particulate Matter from good to unhealthy PM 2.5 is 8.0 micrograms per cubic meter
Particulate Matter - PM2.5
updated 09/20/2014 05:00 PM EDT

at Park Police Headquarters
Visual Range
84 miles

updated 09/20/2014 04:00 PM EDT
  • See more air data »
  • Current Weather »
    at Park Police Headquarters
    updated 09/20/2014 05:00 PM EDT
    Temperature
    81 F

    Humidity
    52 %

    Wind
    SSE-3 mph

  • See more weather data »
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    Last Updated: September 20, 2014