Wisconsin Department of Natural Resources (WDNR)

Based on EPA’s 2008 8-Hour Ozone Standard, parts of Kenosha County in Chicago-Naperville (IL-IN-WI) and Sheboygan County were designated as moderate nonattainment for ozone.

However, in the newly release 2015 8-Hour Ozone Standard, parts of the counties of Manitowoc, Milwaukee, Ozaukee and Sheboygan were designated as marginal nonattainment for ozone. In addition, parts of Oneida County in Rhinelander were classified as nonattainment for SO2.

WDNR’s ERCs are available for six different pollutants:

Pollutant Significant Emission Rates
Nitrogen oxides (NOx) >40 tons/year
Volatile organic material (VOM) >40 tons/year
Sulfur dioxide (SO2) >40 tons/year
Carbon monoxide (CO) >100 tons/year
PM10 >15 tons/year
PM2.5 >10 tons/year

To satisfy offset requirements, new or modified major facilities in nonattainment areas must obtain ERCs to satisfy the offset ratio requirements for proposed emission increases. The offset ratios for the counties of Manitowoc, Milwaukee, Ozaukee and Sheboygan, which were classified as marginal nonattainment area for ozone, are 1.1 to 1. That means if 100 tpy of VOCs are emitted from a proposed new or modified major facility in the above-mentioned counties classified as marginal nonattainment for ozone, the facility must obtain 110 tpy of ERCs to offset the increase in VOC emissions.

On the other hand, offset ratios for Kenosha and Sheboygan Counties as moderate nonattainment areas for ozone is 1.15. That means 115 tpy of VOC ERCs are required from the proposed new or modified major facility in the above-mentioned counties classified as moderate nonattainment for ozone to offset the increase in VOC emissions.

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