1. AIR TOXICS MONITORING DATA EPAs Air Quality System (AQS) Ammonia data available but not in AQS Data for All Substances on Appendix O Total Chromium available not Hexavalent

2. Relevance to Rulemaking While proposed MAAC is based on human health effects, monitoring data is relevant because: Monitoring data supports need for rulemaking. Monitoring data is real world. Monitoring data is more accepted than modeling.

3. Charts Region 6 States, KS, CO & MO 2004 Data Different Monitoring & Analytic Methods Available on DEQ Air Quality website NOT Research or Publication Quality

4. Charts (cont.) Ammonia Arsenic Benzene 1,3-Butadiene Formaldehyde

5. Ammonia

6. Arsenic

7. Benzene

8. 1,3-Butadiene

9. Formaldehyde

10. Importance Monitoring essential to SC42 Proposed MAACs are reasonable Some Toxics Regional/National Problem benzene and 1,3-butadiene