9. Modesto-Merced, CA
Modesto-Merced is ranked 4th for 24-hour particle pollution out of 186 metropolitan areas and 6th for annual particle pollution out of 184 metropolitan areas. In addition, 350 people have lung cancer.
![25 Most Polluted Cities in the US in 2017](https://imonkey-blog.imgix.net/blog/wp-content/uploads/2017/11/03175216/industry-2663189_1280-400x600.jpg?auto=fortmat&fit=clip&expires=1755302400&width=480&height=720)
Pixabay/Public Domain
Modesto-Merced is ranked 4th for 24-hour particle pollution out of 186 metropolitan areas and 6th for annual particle pollution out of 184 metropolitan areas. In addition, 350 people have lung cancer.
Pixabay/Public Domain