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Japanese Nuclear Emergency: Radiation Monitoring

RadNet Deployable Monitoring Data

EPA no longer updates the information at this link, but it may be useful as a reference or resource. This site contains information and data from March 11, 2011 to June 30, 2011. EPA has returned to routine RadNet operations. This site will continue to be available for historical and informative purposes.

For real-time air monitoring data, please visit the EPA RadNet website and Central Data Exchange. To view both current and historical laboratory data, please visit our Envirofacts database.

EPA's Radnet Air Monitoring Data Map

EPA has 40 deployable radiation air monitors that can be sent anywhere in the United States to gather additional data. The RadNet deployable monitors have built-in weather stations and measure gamma radiation. Like all RadNet radiation air monitors, the RadNet deployable monitors send both weather and gamma radiation readings to EPAs National Air and Radiation Environmental Laboratory, hourly.

On this page:

How to Access RadNet Data on EPA's Central Data Exchange (CDX) and Envirofacts


You can find RadNet near-real-time data for all operating monitors on EPA's Central Data Exchange (CDX). Any member of the public may look at the data. You also can view data as scatter or line graphs.
Follow these steps to register and gain access to RadNet data:

  1. Go to https://cdxnode64.epa.gov/radnet-public/query.do
  2. On the left side bar select "Log-in to CDX."
  3. On the new left side bar select "Registration."
  4. Select "Click here to continue."
  5. After reading the Terms and Conditions, select "I accept."
  6. Enter your information including a password. (Please note the password requirements.)
  7. Follow the remaining instructions on the site to complete registration.
  8. Select Radiation Network (RadNet) from the list of programs offered.
  9. One more required field will pop up; enter N/A in the blank "ID" field and click "Finished."
  10. After you see an option to select more programs, you will be taken to the RadNet page.


You can find air filter data, as well as historical radiation data on drinking water, milk, and precipitation on Envirofacts.

  1. Go to https://www.epa.gov/enviro/
  2. Select the "Radiation Topic" tab.
  3. Scroll down to the "Radiation" topic.
  4. Select "GO TO RadNet SEARCH."

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