1970s: Technicians check for air pollution at various stations, outdoors, in Los Angeles County, California, in 1971.

Name: 1970s Technicians Check Air Pollution Various
Uploaded: 2017-06-20T00:00:00.000Z
Duration: 2 min 18 s
Channel: Rick Ray
Description: 1970s: Technicians check for air pollution at various stations, outdoors, in Los Angeles County, California, in 1971. Stock Footage Video (100% Royalty-free) 27993079 | Shutterstock