NASA planes fly over Baltimore power plants and landfills measuring air pollution, greenhouse gases

​Planes are circling over power plants, landfills and airports around Baltimore collecting data for NASA on air pollutants and greenhouse gases.

Researchers and students will fly multiple times between Monday and next Wednesday, June 26, according to a news release from NASA.

Instruments on the aircraft will be measuring carbon dioxide, methane, nitrogen dioxide, formaldehyde and ozone. Researchers will be comparing their measurements with those from an instrument on a commercial...