Photograph of vehicle emissions testing which began in Chattanooga between 1969-1972. The city was declared the most polluted city in the nation in 1969, which prompted Chattanooga to form a board and regulations to clean and improve the air quality. "The Department of Health, Education and Welfare named Chattanooga the most polluted city in the nation. . . Chattanoogans approved a new Air Pollution Control Ordinance in late 1969. This aggressive legislation, which created the current Air Pollution Control Board and Bureau, set restrictions on almost all pollution-causing activities in the county. It placed limits on visible emissions from local industries, and set the attainment date for October 14, 1972. Incredibly, in that three-year period, every major pollution source in Hamilton County was in compliance, at a cost of over $40 million. This tremendous achievement received national attention and was celebrated with "Clean Air Week" during October 1972." Source: Air Pollution Control Board. The Sun Infra-Red exhaust emission tester (also visible in 2014.001.084) was made in the early 1970s, and the woman's outfit is late 1960s / early 1970s. It appears as though American National Bank and Trust Company sponsored all or part of emissions testing in this area.