The EPA ASPECT aircraft recently helped ensure the safety of the crowds which gathered for the successful inauguration.
The Washington Times article “Mapping a picture of Earth’s minute particles from the sky” includes this info (click link for the complete article)
For hours each night, a pilot flew a 1968 Aero Commander dual propeller airplane, crisscrossing the skies around the Capital Beltway. But because of what it carried, the plane actually is the only one of its kind in the country.
Inside, there’s a collection, among other technology, of infrared and gamma-ray spectrometers, a neutron detector, scanners, cameras and broadband satellite equipment that remotely transmit chemical and radiological data back to the scientists on the ground.