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A public hearing is scheduled on November 3, 2009 in Sacramento
to consider proposed amendments to the tables of MIR values for
VOCs, and Doctor Carter’s MIR report is released for comments.
When the Air Resources Board approved regulations containing
maximum incremental reactivity (MIR) values, it required periodic
reviews of MIR values and revision if necessary. The Board also
directed amendments to update the MIR values be conducted through
an Executive Officer Public Hearing. A public hearing to consider
the proposed amendment is scheduled on November 3, 2009 in
Sacramento, California. Please mark your calendar if you plan to
attend.

Dr. Bill Carter recently submitted an updated report, “Updated
Maximum Incremental Reactivity Scale and Hydrocarbon Bin
Reactivities for Regulatory Applications”, and an associated
spreadsheet “HCcalc”, which are posted at ARB’s website:
http://www.arb.ca.gov/research/reactivity/reactivity.htm. We
intend to use the MIR values in this report as the basis for the
revision to be considered at the hearing. 

This report presents an updated table of MIR values for
quantifying relative ground-level ozone impacts of VOCs, and a
revised “bin” method to derive MIR values for complex hydrocarbon
solvents. The revised method derives a chemical composition for
each hydrocarbon bin, and uses MIR values for each constituent to
calculate the MIR value for each bin. 

Please review the report and the list of compounds and mixtures
for which Dr. Carter’s report provides MIR values. If you have
comments or suggestions for additional substances to be listed,
please contact me at rpropper@arb.ca.gov or (916) 323-1535. 

We expect to hold a public workshop in Sacramento on August 4 to
discuss these planned revisions to the MIR values, in conjunction
with a consumer products workshop. An announcement letter will be
posted soon to the website, 
http://www.arb.ca.gov/consprod/regact/tscpwg/tscpwg.htm.



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