“… While there is a larger qualitative literature on this topic (Brimblecombe, ; Mosley, ; Thorsheim, ), estimates of the relationship between pollution and mortality largely begin in the middle of the twentieth century (Barreca et al ., ; Clay et al ., , ). A number of studies investigate the health impacts of particular pollution events in the twentieth century (Townsend ; Logan, ; Greenburg et al ., ; Ball, ).…”