Proposed Monitoring Network Changes for 2012
A pollutant by pollutant discussion of the basis for the changes to the network, the
underlying rules and requirements, Illinois EPA’s proposed actions in specific areas and a
detailed listing of specific sites that have proposed changes is provided on the following
There is no federal/state monitoring requirement for carbon monoxide. Nine sites were
operated in 2011 with no changes proposed for 2012.
There is no federal/state monitoring requirement for nitrogen dioxide. However, three
sites are required in the Chicago area as part of the USEPA approved “Lake Michigan
Alternate PAMS Plan”. Seven sites were operated in 2011 with no changes proposed for
There are eight sites required under federal/state rules, three sites in the Metropolitan
Chicago area, two in the Metropolitan St. Louis area and three areas where
concentrations were found to exceed the hourly sulfur dioxide air quality standard. A
total of fourteen sites were operated in 2011 with no changes proposed for 2012.
Particulate Matter (PM10)
There are four sites required under federal/state rules, one in each of the four original
PM10 nonattainment areas. A total of five sites were operated in 2011 and no changes
have been proposed in 2012.
Particulate Matter (PM2.5)
There are five sites required under federal/state monitoring rules and two sites required as
part of the USEPA approved plan for NCore (National Trend Sites) monitoring bringing
the state total number of required sites to seven. Thirty four sites were operated in 2011.
The 2012 plan also proposes thirty four sites with one site being relocated as follows:
170190004 Champaign 606 E. Grove Neighborhood SLAMS discontinued
and moved to a new location at:
170190006 Champaign 904 N. Walnut Neighborhood Scale SLAMS
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