2 images. Federal smoggers, 1 February 1956. Smith Griswold (Smog Control Chief); Vernon G. MacKenzie; Leslie Chambers; Robert Chass; Robert Stern.; Caption slip reads: "Photographer: Gray. Date: 1956-02-01. Reporter: White. Assignment: Federal smoggers. Special Instructions: Cover.9/10, L to R seated: Smog Control Chief Smith Griswold; Vernon G. MacKenzie; Leslie Chambers. Standing, L to R: Robert Chass, APCD Engineering Evaluation Chief; Arthur Stern. MacKenzie; Stern and Chambers are Federal air pollution experts."