CHEMICAL PROFILES|Environmental Hazard Value Scores (IRCH)



TECHNICAL DETAILS ON HOW SCORES ARE DERIVED
The IRCH system assigns hazard scores between 0 and 100 based on the following algorithm:

Environmental Hazard = HVwater+ HVair + HVland + HVglobal

The IRCH system is an improvement over other ranking systems because it considers ecological impacts in water, air, and land. In contrast, the UTN system, for example, only considers aquatic ecosystem effects.

Several policy choices influence the rankings that result from use of this algorithm. First, it is possible to give equal or different weights to hazard values for the various endpoints within an effect category (e.g., to give double weight to compounds that harm aquatic life). Second, some method of assigning hazard values to parameters that lack data is required (e.g., to treat the absence of data as indicating the absence of hazard, or to penalize data gaps). IRCH uses several alternative chemical rankings based on different versions of these policy choices.

EDF was unable to extend the IRCH system to additional chemicals because the Scorecard lacks some of data elements that are required by this system.

REFERENCE
IRCH: IIndiana Relative Chemical Hazard Score. Indiana Clean Manufacturing Technology and Safe Materials Institute.
http://www.ecn.purdue.edu/CMTI/Pollution_Prevention_Progress_Measurement_Method/
Values from Indiana Relative Chemical Hazard Score - CAS Order (Updated 5/22/02)