Analysis of Monitoring Data Demonstrates Need for Stronger 24-Hour Standard, November 12, 2003
Dr. Linnea M. Avallone, Professor of Atmospheric and Oceanic Sciences at University of Colorado, presented a unique analysis of PM2.5 monitoring data at the November 12, 2003 meeting of the Clean Air Scientific Advisory Committee.
Testifying on behalf of Environmental Defense, Prof. Avallone demonstrated through an analysis of paired monitoring stations with identical annual mean PM2.5 values, that the 98th percentile 24-hour concentrations can differ vastly, due to the varying distributions of daily PM values at different locations.
The analysis indicated that the highest 2% of daily PM values contribute disproportionately to cumulative exposure, as much as 30%. Substantial benefits in exposure can be achieved by reducing the 98th percentile metric.
A copy of her presentation is attached.
Attachments
- Presentation of Prof. Linnea M. Avallone 11-12-03
- avallonecasacslides.pdf
Presentation of Prof. Linnea M. Avallone representing Environmental Defense, 11-12-03
