The 1970's Los Angeles Photogenic Smog

https://www.marketplace.org/2014/07/14/sustainability/we-used-be-china/la-smog-battle-against-air-pollution https://images.search.yahoo.com/search/images;_ylt=AwrBTz4q_C5ZFrUAUT5XNyoA;_ylu=X3oDMTByMjB0aG5zBGNvbG8DYmYxBHBvcwMxBHZ0aWQDBHNlYwNzYw--?p=LA+smog&fr=dss_yset_chr http://abcnews.go.com/WNT/story?id=129572&page=1