In the media, especially the "news" papers, a good many items these days are sourced from web sites that often are not attributed. Science Daily is one favourite to be raided.
This is one I picked up when checking it out entitled "Consumer and industrial products now a dominant urban air pollution source".
"We've reached that transition point already in Los Angeles," It might explain some other things.
The conclusion is:
McDonald said. He and his colleagues found that they simply could not reproduce the levels of particles or ozone measured in the atmosphere unless they included emissions from volatile chemical products.
In the course of that work, they also determined that people are exposed to very high concentrations of volatile compounds indoors, which are more concentrated inside than out, said co-author Allen Goldstein, from the University of California Berkeley.
"Indoor concentrations are often 10 times higher indoors than outdoors, and that's consistent with a scenario in which petroleum-based products used indoors provide a significant source to outdoor air in urban environments."
The new assessment does find that the U.S. regulatory focus on car emissions has been very effective, said co-author Joost de Gouw, a CIRES chemist. "It's worked so well that to make further progress on air quality, regulatory efforts would need to become more diverse," de Gouw said.
"It's not just vehicles any more."
There is another thing, how many people are paying a good deal of money out for stuff they do not really need?