6. Hydrocarbon Emissions and Photochemical Smog In about 1943, people in Los Angeles began to experience a new kind of air pollution After an intensive period of research, in the early 1950s, A.J. Haagen-Smit and his colleagues first arrived at an understanding of the basic processes that were responsible The basic ingredients of what is now called photochemical smog are sunlight, NO2, and hydrocarbons In a study of the Los Angeles air, 56 different Arie Jan Haagen-Smit(1900-1977) species of gaseous hydrocarbons were Professor at caltech. He was a identified, but apparently the number Dutch Chemist. He is best known observed is limited only by the sensitivity of for linking the smog in Southern the analytical techniques used Califonia to automobiles and is therefore known by many as the father"of air pollution control6. Hydrocarbon Emissions and Photochemical Smog • In about 1943, people in Los Angeles began to experience a new kind of air pollution. • After an intensive period of research, in the early 1950s, A. J. Haagen-Smit and his colleagues first arrived at an understanding of the basic processes that were responsible. • The basic ingredients of what is now called photochemical smog are sunlight, NO2 , and hydrocarbons. • In a study of the Los Angeles air, 56 different species of gaseous hydrocarbons were identified, but apparently the number observed is limited only by the sensitivity of the analytical techniques used. Arie Jan Haagen-Smit (1900-1977) Professor at Caltech. He was a Dutch Chemist. He is best known for linking the smog in Southern Califonia to automobiles and is therefore known by many as the "father" of air pollution control