NIST has responded to AIGER needs by developing four new SRMs with significantly lower concentrations of carbon dioxide, nitric oxide, and propane. They are:
SRM 2737 (500.0 ± 7.5) nmol/mol nitric oxide in nitrogen
Nitric oxide and propane are precursors to smog formation. The new SRMs allow lower levels of these precursors to be monitored. It is estimated that when the regulations are fully implemented in 2010, smog-forming emissions in the Los Angeles area will be reduced by 57 tons per day. SRM 2617 is a high-accuracy carbon dioxide standard that will be used to measure fuel economy.
Research to minimize cylinder wall off-gassing of NO over time will be studied.
Lead Organizational Unit:mml
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