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

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

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

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

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

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

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

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

Galveston Airport CATMN Annual Average Trends for Benzene and 1,3-Butadiene from ppbv benzene1,3-butadiene n=15 Considered Background for Houston Area

Galena Park CATMN Annual Average Trends for Benzene and 1,3-Butadiene from ppbv benzene1,3-butadiene Benzene annual ESL

Annual Average and Highest CATMN 24-Hour 1,3-Butadiene Levels Monitored at Milby Park Annual AverageHighest 24-Hour2nd Highest 24-Hour Concentration (ppbv) Current Annual ESL

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

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

Deer Park Annual Average Trends for Formaldehyde from US Average Site Concentration

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

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

Deer Park Annual Average Trends for Arsenic PM2.5 from Arsenic (inorganic) ESL