EPA’s nationwide radiation monitoring system, RadNet, consists of two components. First, stationary and deployable air monitors measure radiation 24 hours a day, 7 days a week. The map provides monitoring results as graphs that are updated several times daily. You can also search the RadNet database in EPA’s Central Data Exchange (CDX) to find monitoring data. Second, EPA samples precipitation, drinking water, and milk on a routine schedule and tests them for radiation in a laboratory. The latest RadNet sampling results are available in Envirofacts.