Jfc United States
IvU Environmental Protection
* w I	Agency

Counties with Monitors Projected to Violate the 2008 8-Hour Ozone Standard

of 0.075 parts per million (ppm) in 2020

3 Modeled emissions reflect the expected reductions from federal programs including the Clean Air
Interstate Rule, the Clean Air Mercury Rule, the Clean Air Visibility Rule, the Clean Air Nonroad Diesel
Rule, the Light-Duty Vehicle Tier 2 Rule, the Heavy Duty Diesel Rule, proposed rules for Locomotive
and Marine vessels and for Small Spark-Ignition Engines; as well as illustrative state and local level
mobile and stationary source controls identified for the purpose of attaining the 1997 ozone and 2006
PM2.5 standards. States may choose to apply different control strategies for implementation.

1	28 counties are projected to violate the 2008 8-hour ozone
standard of 0.075 parts per million (ppm).

2	Future ozone levels were projected only for counties with
monitoring data and within the contiguous 48 states.

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