1. Air Toxics Monitoring Results in the Houston-Galveston Area David Brymer, Texas Commission on Environmental Quality

2. Top 20 Compounds (by annual average concentration) during 2004 from Houston Area

3. Annual Average CATMN 24-Hour Benzene Levels Monitored at Houston Area Sites in 2004 Annual ESL

4. Is Benzene Trending Up or Down at Houston Area Sites ? Least Squares Regression Model CATMN 24-Hour Benzene

5. Least Squares Plot of CATMN 24-Hour Benzene Levels at Clinton Drive

6. Annual Average CATMN 24-Hour 1,3-Butadiene Levels Monitored at Houston Area Sites in 2004 Current ESL

7. Is 1,3-Butadiene Trending Up or Down at Houston Area Sites? Least Squares Regression Model of CATMN 24-Hour 1,3 Butadiene

8. Least Squares Plot of CATMN 24-Hour 1,3-Butadiene Levels at Clinton Drive

9. Galveston Airport CATMN Annual Average Trends for Benzene and 1,3-Butadiene from 1997 - 2005 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 199719981999200020012002200320042005 ppbv benzene1,3-butadiene n=15 Considered Background for Houston Area

10. Galena Park CATMN Annual Average Trends for Benzene and 1,3-Butadiene from 1998 - 2005 0 0.5 1 1.5 2 19981999200020012002200320042005 ppbv benzene1,3-butadiene Benzene annual ESL

11. Annual Average and Highest CATMN 24-Hour 1,3-Butadiene Levels Monitored at Milby Park 1999-2004 3.5 4.4 2.4 2.1 3.2 4.0 31.6 30.9 12.3 14.5 17.6 37.4 8.8 20.5 10.3 11.0 15.1 23.4 0 5 10 15 20 25 30 35 40 Annual AverageHighest 24-Hour2nd Highest 24-Hour Concentration (ppbv) Current Annual ESL 199920002001200220032004

12. How Representative are CATMN Data (every 6 th day sampling) of an Annual Average? 1,3 Butadiene AutoGC (6694 observations) = 0.62 ppbv CATMN (59 observations) = 0.57 ppbv Benzene AutoGC (6815 observations) = 0.67 ppbv CATMN (59 observations) = 0.71 ppbv Comparison of Clinton Drive AutoGC and CATMN 2004 Annual Averages for Benzene and 1,3-Butadiene

13. 2004 Annual Average 24- hr Formaldehyde Levels in Houston Area Rural Tx site Clinton Drive data invalidated due to sampler problem Av. US Site Conc. = 3.5 ppbV

14. Deer Park Annual Average Trends for Formaldehyde from 2000 - 2004 2003 US Average Site Concentration

15. 2004 Annual Average 24 hr Values (ug/m3) of Chromium and Arsenic at NATTS sites Chromium ESL=0.1; Arsenic & Chrome VI ESL=0.01

16. Deer Park Annual Average Trends for Chromium PM2.5 from 2000 - 2004 Chromium ESL=0.1; Chrome VI ESL=0.01

17. Deer Park Annual Average Trends for Arsenic PM2.5 from 2000 - 2004 Arsenic (inorganic) ESL