Fraction of TNMHC Accounted for by
Targeted and Non-Targeted Compounds at Selected
MARAMA PAMS Sites During the 1995 Summer Morning Hours

- TNMHC is total non-methane hydrocarbons, AIRS parameter code 43102.
- Targeted compounds are the 55 volatile organic compunds individually measured at PAMS stations.
- Time is daylight saving time.
- ppbC is parts per billion carbon.
- Morning hours (6-9 a.m.) are used because the daily ozone reaction cycle has not begun to convert the VOCs to ozone.
Source: Mark Schmidt of EPA prepared this chart based on data in the AIRS system.

Back to Measurement of Specific Volatile Organic Compounds Index

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Last revised: 11/17/98