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

0

12

3

4

56

7

89

10

Mea

n pp

bv

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

00.20.40.60.8

1

1.21.41.61.8

2

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pp

bv Annual ESL

Is Benzene Trending Up or Down at Houston Area Sites ?

Site _DEPVAR__RMSE_Intercept Slope (Date) min_date max_date N_dateTexas City-Ball Park Benzene_ppbv0.487 0.000042 11/24/1997 3/17/2005 132Galveston Airport Benzene_ppbv0.117 0.000020 11/23/1996 3/11/2005 70Texas City-Nessler Pool Benzene_ppbv3.771 -0.000193 12/2/1992 3/5/2005 224Aldine Benzene_ppbv1.584 -0.000054 11/17/1995 3/29/2005 269Channelview Benzene_ppbv2.801 -0.000125 12/8/1992 3/29/2005 431Tomball Benzene_ppbv-0.432 0.000071 5/17/1998 3/5/2005 53Bayland Park Benzene_ppbv2.047 -0.000090 4/23/1998 3/5/2005 119Galena Park Benzene_ppbv-0.461 0.000142 11/6/1997 3/29/2005 317Baytown Benzene_ppbv0.809 -0.000010 8/15/1998 3/23/2005 169Shore Acres Benzene_ppbv-0.827 0.000152 11/25/1998 3/23/2005 122Milby Park Benzene_ppbv2.561 -0.000116 4/12/1999 2/3/2005 232HRM-3 Haden Road Benzene_ppbv6.433 -0.000361 12/26/1992 3/23/2005 447Clinton Drive Benzene_ppbv4.795 -0.000256 3/14/1993 3/23/2005 447Deer Park Benzene_ppbv1.474 -0.000038 12/11/1996 3/11/2005 234

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

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Current ESL

Is 1,3-Butadiene Trending Up or Down at Houston Area Sites?

Site Intercept Slope (Date) min_date max_date N_dateTexas City-Ball Park 2.239 -0.000117 11/24/1997 3/17/2005 132Galveston Airport 0.129 0.000015 11/23/1996 3/11/2005 70Texas City-Nessler Pool 5.516 -0.000347 12/2/1992 3/5/2005 224Aldine 0.993 -0.000047 11/17/1995 3/29/2005 269Channelview 1.144 -0.000038 12/8/1992 3/29/2005 431Tomball 2.228 -0.000132 5/17/1998 3/5/2005 53Bayland Park 1.103 -0.000058 4/23/1998 3/5/2005 119Galena Park 1.680 -0.000072 11/6/1997 3/29/2005 317Baytown 2.270 -0.000125 8/15/1998 3/23/2005 169Shore Acres 1.232 -0.000057 11/25/1998 3/23/2005 122Milby Park 8.303 -0.000280 4/12/1999 2/3/2005 232HRM-3 Haden Road 2.570 -0.000135 12/26/1992 3/23/2005 447Clinton Drive 2.430 -0.000119 3/14/1993 3/23/2005 447Deer Park 1.216 -0.000056 12/11/1996 3/11/2005 234

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 1997 - 2005

00.050.1

0.150.2

0.250.3

0.35

1997 1998 1999 2000 2001 2002 2003 2004 2005

pp

bv

benzene 1,3-butadiene

n=15

Considered Background for Houston Area

Galena Park CATMN Annual Average Trends for Benzene and

1,3-Butadiene from 1998 - 2005

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0.5

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1.5

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1998 1999 2000 2001 2002 2003 2004 2005

pp

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benzene 1,3-butadiene

Benzene annual ESL

Annual Average and Highest CATMN 24-Hour 1,3-Butadiene Levels

Monitored at Milby Park 1999-2004

3.5 4.42.4 2.1 3.2 4.0

31.6 30.9

12.314.5

17.6

37.4

8.8

20.5

10.3 11.0

15.1

23.4

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Annual Average Highest 24-Hour 2nd Highest 24-Hour

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Current Annual ESL

1999 2000 2001 2002 2003 2004

How Representative are CATMN Data (every 6th 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

00.5

11.5

22.5

33.5

44.5

5

Deer Park Clinton Drive* Channelview Karnack

Mea

n p

pb

v

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 2000 - 2004

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2000 2001 2002 2003 2004

Mea

n p

pb

v

n=64

n=67

n=59

n=56

n=58

2003 US Average Site Concentration

2004 Annual Average 24 hr Values (ug/m3) of Chromium and Arsenic at NATTS sites

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0.002

0.004

0.006

0.008

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Chromium ESL=0.1; Arsenic & Chrome VI ESL=0.01

Deer Park Annual Average Trends for Chromium PM2.5 from 2000 - 2004

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0.0002

0.0004

0.0006

0.0008

0.001

0.0012

2000 2001 2002 2003 2004

Mea

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n=137

n=151

n=126 n=214n=195

Chromium ESL=0.1; Chrome VI ESL=0.01

Deer Park Annual Average Trends for Arsenic PM2.5 from 2000 - 2004

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0.002

0.004

0.006

0.008

0.01

0.012

2000 2001 2002 2003 2004

Me

an

ug

/m3

n=137 n=151 n=126n=214

n=195

Arsenic (inorganic) ESL