LA Areas With the Dirtiest Air

Los Angeles consistently ranks among the cities with the worst air pollution. But how does the air quality vary from neighborhood to neighborhood?

We examined the air quality of 251 neighborhoods, cities and towns across LA county hour by hour for almost an entire year.

We looked for the areas where air quality (concentrations of PM 2.5) frequently rose above 100 on the Air Quality Index scale, which is considered unhealthy. We examined 6802 hourly readings between November 2016 and October 2017.

What we found:

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