Sorry for the confusion, on the worst single day of smog I observed in Pasadena during the early 80s, the visibility was about as bad some 5-10 days I have observed in Beijing and multiple other cities in the last 2-3 years. It's not getting better, and it is so much worse than it was 15 years ago!
I thought it was getting better in China this year... I really did, but then winter came and you could barely see across the street at midday. Southern California meanwhile went from months of missing mountains to a day or two here and there during the summer over the course of 10 years as catalytic converters became standard.
I thought it was getting better in China this year... I really did, but then winter came and you could barely see across the street at midday. Southern California meanwhile went from months of missing mountains to a day or two here and there during the summer over the course of 10 years as catalytic converters became standard.