By 2004, Hoosiers will breathe cleaner air because of action taken today by the Indiana Air Pollution
Control Board. With a vote of 11-0, the board unanimously adopted the Indiana Nitrogen Oxides Control
"The adoption of this rule will play a major role in making the air in Indiana cleaner and safer to
breathe," said Lori F. Kaplan, commissioner of IDEM. "This rule will put controls in place that
should, when combined with the actions of the other states, work to meet ozone-based health
standards statewide and make a giant stride toward meeting the new ozone standards recently set
During the development of the rule, IDEM considered four major principles to ensure a balanced
rule: achieve the goal of established NOx emissions reductions; meet approval requirements of the
U.S. Environmental Protection Agency; reduce costs for both industry and the consumer; and
encourage the development of a clean, reliable energy supply in Indiana.
Major elements of the Indiana Nitrogen Oxides Control Rule include:
A 31 percent statewide reduction in NOx emissions from 1995 levels by May 31, 2004,
A 66 percent statewide reduction in NOx emissions from 1995 levels emitted from fossil-fuel-
fired electric plants by May 31, 2004,
A 55 percent reduction in NOx emissions from large industrial boilers by May 31, 2004,
A cap and trade emission allowance program that allows the trading of NOx "allowances" between
facilities for cost effective approaches to NOx reduction goals,
Incentives for energy efficiency/renewable sources of power (Indiana is only one of five states
to include this type of provision and the incentives are among the largest in the nation),
An effective continuous emission monitoring system to assure compliance among most large
emitters for NOx emission requirements and
Control requirements for large cement kilns that require either the use of specified technology
or an emissions reduction of 30 percent.
The Indiana Nitrogen Oxides Control Rule (326 IAC 10-3, 10-4) is in response to the U.S. EPA federal
rule passed in 1998 that requires 22 states and the District of Columbia to submit state
implementation plans to reduce the regional transport of ozone and to reduce nitrogen oxide
emissions in the affected states.
Nitrogen oxide is a precursor to the formation of ground-level ozone. About 60 percent of the
nitrogen oxide emissions in Indiana come from large industrial boilers or electric utilities.
For further information and a copy of the Indiana Nitrogen Oxides Reduction Rule, please visit
the IDEM Web site.