These maps depict changes in fine particulate matter and ozone concentrations in large cities that are expected to occur with the implementation of power plant standards like the Clean Power Plan. The policy depicted in the maps would reduce carbon dioxide emissions from the US power sector by 35% from 2005 levels and allow for flexible compliance mechanisms. The resulting improvements in air quality are shown for 41 cities with populations greater than 330,000. Larger gains are indicated by darker shades of green. The size of the circle indicates the population of that city and therefore the number of people who will benefit from improved air quality in the location.

Sources: 
The maps are based on results from Driscoll et al. 2015, Nature Climate Change. US power plant carbon standards and clean air and health co-benefits. doi:10.1038/nclimate2598.
The estimates of economic benefits are based on Buonocore et al. 2016, PLoS One. An Analysis of Costs and Health Co-Benefits for a U.S. Power Plant Carbon Standard.  doi.org/10.1371/journal.pone.0156308.
 

Urban air quality improvement map

 

Air quality improvements due to reduced fine particulate matter 

Air quality improvements in cities map: Ozone

 

Air quality improvements due to reduced ozone