Air Pollution:

Efforts To Control Ozone in Areas of Illinois, Indiana, and Wisconsin

RCED-88-46BR: Published: Jan 29, 1988. Publicly Released: Feb 22, 1988.

Additional Materials:


Office of Public Affairs
(202) 512-4800

In response to a congressional request, GAO evaluated Environmental Protection Agency (EPA) and state efforts to control hydrocarbon emissions in southeastern Wisconsin, northeastern Illinois, and northwestern Indiana, to determine: (1) whether Illinois and Indiana are contributing to Wisconsin's ozone problems; (2) why the two states have not obtained EPA approval of their ozone control plans; (3) why EPA failed to develop plans for the two states; (4) whether the EPA process for determining air quality violations across state lines is useful for ozone; (5) whether EPA uniformly implements construction bans nationwide; and (6) whether factories within the three states emit significant amounts of hydrocarbons.

GAO found that: (1) because of the complexity of ozone formation, EPA officials and the states were unable to determine the exact source of Wisconsin's ozone problems; (2) EPA officials and the states agreed that industrial pollution from Chicago and northwestern Indiana may have contributed to the ozone problems in two Wisconsin counties; (3) Illinois and Indiana disagreed with Wisconsin on the effects of their emissions on Wisconsin's ozone level; and (4) EPA believes that industrial emissions from Wisconsin could also be significantly polluting its air. GAO also found that: (1) EPA did not fully approve the Indiana and Illinois ozone control plans because they failed to implement federal requirements for vehicle inspection and maintenance programs; (2) both states passed legislation implementing the measures to reduce the levels of industrial pollutions affecting the ozone layer; (3) EPA proposed to ban the construction or modification of factories that would produce large amounts of ozone until it fully approved the states' ozone plans; and (4) Congress recently enacted legislation prohibiting EPA from imposing sanctions in ozone and carbon monoxide nonattainment areas until August 1988.

Mar 12, 2018

Feb 22, 2018

Jan 26, 2018

Jan 19, 2018

Jan 4, 2018

Dec 22, 2017

Dec 13, 2017

Nov 15, 2017

Nov 2, 2017

Oct 30, 2017

Looking for more? Browse all our products here