# CHAPTER 5

MICROSCALE STUDY

# MATES III Final Report

5-1 

# Chapter 5. Microscale Study

5.1 Introduction

The microscale component of MATES II utilized movab le platforms to sample for periods of

several weeks to several months at selected locatio ns. The platforms would then be moved to

other sites for similar sampling. The objective fo r this element was to determine if there were

gradients in ambient levels between communities tha t were not otherwise captured by the fixed

monitoring sites. Each microscale site is paired w ith the closest fixed site for comparison to

determine if toxic air contaminant levels at these microscale sites statistically exceed a

neighboring fixed site.

Since the sampling periods for the microscale sites are limited, annual averages for measured

substances cannot be calculated. However, by compa ring the levels from the microscale sites to

those from the nearest fixed site during the timefr ame that the microscale site was operating can

yield insights on potential community gradients.

5.2 Site Selection

The microscale sites utilized the SCAQMD’s mobile m onitoring platforms and were situated

near air toxic emission sources. As in MATES II, d ue to the limited number of mobile

monitoring platforms, each microscale site study la sted for a shorter duration than the overall

study for approximately two to several months.

Microscale sites were selected with the input of th e Technical Advisory Group and used criteria

including the following:

• Proximity to emissions source(s);

• Areas identified with environmental justice issues;

• Potential for neighborhood gradients;

• Elevated risks from MATES II modeling analysis;

• Community concerns; and

• Geographic equity.

Other considerations included power availability, s ecurity, accessibility to SCAQMD staff and

availability of the premises for a several-month pe riod.

# MATES III Final Report

5-2 A listing of the microscale sites, along with the n earest fixed site and the time periods for which

samples were taken, are shown below. The locations of the sites compared to the fixed sites are

shown in Figure 2-1 in Chapter 2.

5.3 Microscale Sites and Sampling Periods

Microscale Site Fixed Site Category Sampling Period

Commerce Huntington Park VOC November 11th 2004 - M ay 16th 2005

PM 2.5 

# January 19th 2005 - May 16th 2005

TSP November 8th 2004 - May 4th 2005

PM 10 

# November 11th 2004 - May 4th 2005

Chromium 6 November 8th 2004 - May 16th 2005

Indio Rubidoux VOC March 2nd 2005 - May 16th 2005

PM 2.5 

# February 24th 2005 - June 18th 2005

TSP February 24th 2005 - June 18th 2005

PM 10 

# February 27th 2005 - June 18th 2005

Chromium 6 February 24th 2005 - June 18th 2005

San Bernardino Inland Valley San Bernardino VOC Oc tober 3rd 2004 - February 15th 2005

PM 2.5 

# January 16th 2005 - February 15th 2005

TSP September 18th 2004 - February 3rd 2005

PM 10 

# September 18th 2004 - February 3rd 2005

Chromium 6 September 18th 2004 - February 15th

2005

Sun Valley Burbank VOC June 3rd 2005 – March 30 200 6

PM 2.5 

# June 3rd 2005 - April 29th 2006

TSP June 30th 2005 - April 8th 2006

PM 10 

# June 3rd 2005 - April 8th 2006

Chromium 6 June 3rd 2005 – June 25 2006

Santa Ana Anaheim VOC September 1st 2005 - January 29th 2006

PM 2.5 

# July 21st 2005 - January 26th 2006

TSP July 24th 2005 - January 23rd 2006

PM 10 

# July 24th 2005 - January 23rd 2006

Chromium 6 July 21st 2005 - January 26th 2006



# The average levels measured for several toxic air c ontaminants are listed in the following tables.

To assess the potential differences between the mic roscale and fixed sites, a statistical t-test was

conducted for each pollutant measured, with the cor responding P-value also shown. Since

multiple statistical tests were conducted, one coul d expect several differences to show up based

on chance. The P-values greater than 0.05 are deno ted as a difference between sites, with a

notation of which site was higher. Caution should be used in interpreting these tests, as no

# MATES III Final Report

5-3 correction was made for conducting multiple statist ical comparisons. That is, at a P-value of

0.05, one would expect to see significant differenc e 5% of the time, on average.

One of the objectives of the microscale site study was to determine if some communities show

higher levels of pollutants compared with those of the fixed sites. Several of such pollutants

were at levels below the Method Detection Limits (M DL). While statistically significant, these

differences may not be truly different, as levels b elow the MDL are associated with greater

uncertainty. Thus, only substances that were above the method detection limits and showed

statistically higher averages for the microscale si tes compared to the nearest fixed site are

highlighted in Tables 5-1 through 5-5.MATES IIIFinal Report5-4Table 5-1.Comparison of Observed Concentrations for the Microscale and Fixed Site Pair of Commerce and Huntington ParkMicroscale SiteCommerceFixed SiteHuntington Park StatisticallyPollutant Category Units AVG S.D. N 95%CI AVG S.D.N 95%CI P-Value Significant?Acetaldehyde VOC ppb 1.69 0.83 60 0.21 1.76 0.87 630.21 0.65 NoAcetone VOC ppb 2.49 2.69 60 0.68 3.12 2.93 63 0.720.22 NoBenzene VOC ppb 0.69 0.33 62 0.08 0.93 0.52 46 0.150.008 Yes (fixed > micro)Carbon Tetrachloride VOC ppb 0.08 0.01 62 0 0.08 0.01 46 0 0.87 NoChloroethene (Vinyl Chloride) VOC ppb 0 0 62 -- 0 046 -- -- --Chloroform VOC ppb 0.03 0.01 62 0 0.04 0.02 46 0.010.02 Yes (fixed > micro)Ethylbenzene VOC ppb 0.24 0.14 62 0.03 0.46 0.3 460.09 1.95E-05 Yes (fixed > micro)Formaldehyde VOC ppb 3.55 1.38 60 0.25 4.05 1.65 630.41 0.07 NoMethyl Ethyl Ketone VOC ppb 0.31 0.25 60 0.06 0.4 0.3 63 0.07 0.06 NoMethyl Tertiary Butyl Ether VOC ppb 0.02 0.01 62 00.02 0.03 46 0.01 0.15 NoMethylene Chloride VOC ppb 0.28 0.16 62 0.04 0.39 0.45 46 0.13 0.12 NoPerchloroethylene VOC ppb 0.06 0.04 62 0.01 0.11 0.1 46 0.03 0.002 Yes (fixed > micro)Styrene VOC ppb 0.06 0.05 62 0.01 0.09 0.06 46 0.020.014 Yes (fixed > micro)Toluene VOC ppb 2.01 1.11 62 0.28 3.36 2.18 46 0.630.0003 Yes (fixed > micro)Trichloroethylene VOC ppb 0.05 0.25 62 0.06 0.02 0.03 46 0.01 0.49 No(m+p)-xylenes VOC ppb 0.91 0.55 62 0.04 1.75 1.13 46 0.33 1.94E-05 Yes (fixed > micro)o-xylene VOC ppb 0.3 0.17 62 0.04 0.42 0.33 46 0.10.04 Yes (fixed > micro)1,2-Dichlorobenzene VOC ppb 0 0 62 -- 0 0.01 46 0 0.17 No1,2-Dichloroethane VOC ppb 0.01 0.01 62 0.0016 0 0.01 46 0.0015 7.08E-12 Yes (micro > fixed)1,2-Dichloropropane VOC ppb 0 0 62 -- 0 0 46 -- --No1,4-Dichlorobenzene VOC ppb 0.04 0.03 62 0.01 0.080.06 46 0.02 4.70E-05 Yes (fixed > micro)1,2-Dibromoethane VOC ppb 0 0 62 -- 0 0 46 -- -- --1,3-Butadiene VOC ppb 0.18 0.14 62 0.04 0.23 0.16 46 0.05 0.1 NoArsenic PM2.5ng/m30.96 0.71 38 0.23 1.57 3.85 39 1.21 0.29 NoCadmium PM2.5ng/m31.58 1.24 38 0.39 2.02 1.74 39 0.55 0.19 NoLead PM2.5ng/m37.02 5.99 38 1.9 7.66 4.38 39 1.37 0.59 NoChromium PM2.5ng/m31.21 0.89 38 0.28 2.4 3.06 39 0.96 0.02 Yes (fixed> micro)Manganese PM2.5ng/m33.35 2.52 38 0.8 5.33 7.08 39 2.22 0.11 NoVanadium PM2.5ng/m33.99 4.22 38 1.34 4.18 4.14 39 1.3 0.84 NoNickel PM2.5ng/m32 1.38 38 0.44 2.48 2.13 39 0.67 0.24 NoCopper PM2.5ng/m313.72 5.52 38 1.76 41 15.25 39 4.79 5.26E-14 Yes (fixed > micro)Elemental Carbon PM2.5μg/m31.89 0.91 37 0.29 2.11 1.49 39 0.47 0.44 NoArsenic TSP ng/m30.9 0.73 56 0.19 1.53 2.66 58 0.69 0.09 NoCadmium TSP ng/m31.36 0.68 56 0.18 1.54 0.93 58 0.24 0.25 NoLead TSP ng/m319.83 16.26 56 4.26 28.69 30.29 58 7.8 0.05 NoChromium TSP ng/m34.35 2.81 56 0.74 11.98 18.68 58 4.81 0 Yes (fixed> micro)Manganese TSP ng/m326.29 17.44 56 4.57 32.45 25.42 58 6.54 0.13 NoVanadium TSP ng/m34.77 3.95 56 1.03 5.6 4.84 58 1.25 0.32 NoNickel TSP ng/m33.79 2.29 56 0.6 7.48 7.06 58 1.82 0 Yes (fixed >micro)Copper TSP ng/m355.26 24.51 56 6.42 200.1 110.89 58 28.54 3.98E-14Yes (fixed > micro)Hexavalent Chromium TSP ng/m30.22 0.16 62 0.04 0.24 0.18 64 0.04 0.55 NoElemental Carbon PM10μg/m32.69 1.08 48 0.31 3.15 1.6 58 0.41 0.08 NoMATES IIIFinal Report5-5Table 5-2.Comparison of Observed Concentrations for the Microscale and Fixed Site Pair of Indio and RubidouxMicroscale Site -Indio Fixed Site - Rubidoux StatisticallyPollutant Category Units AVG S.D. N 95%CI AVG S.D.N 95%CI P-Value Significant?Acetaldehyde VOC ppb 1.01 0.41 33 0.41 1.33 0.68 360.22 0.11 NoAcetone VOC ppb 1.38 0.67 33 0.23 1.33 0.55 36 0.180.77 NoBenzene VOC ppb 0.21 0.1 26 0.04 0.39 0.23 26 0.090.0006 Yes (fixed > micro)Carbon Tetrachloride VOC ppb 0.08 0.01 26 0.0034 0.08 0.01 26 0.0029 0.002 Yes (fixed > micro)Chloroethene (Vinyl Chloride) VOC ppb 0.01 0.04 260.02 0 0 26 -- 0.33 NoChloroform VOC ppb 0.02 0.02 26 0.01 0.03 0.01 26 00.7 NoEthylbenzene VOC ppb 0.07 0.04 26 0.02 0.16 0.12 260.04 5.00E-04 Yes (fixed > micro)Formaldehyde VOC ppb 1.94 0.9 33 0.31 2.85 1.3 36 0.42 0.13 NoMethyl Ethyl Ketone VOC ppb 0.22 0.11 33 0.04 0.240.12 36 0.04 0.63 NoMethyl Tertiary Butyl Ether VOC ppb 0.02 0.06 26 0.02 0.01 0.01 26 0 0.42 NoMethylene Chloride VOC ppb 0.08 0.03 26 0.01 0.21 0.09 26 0.03 6.40E-08 Yes (fixed > micro)Perchloroethylene VOC ppb 0.01 0.02 26 0.01 0.03 0.03 26 0.01 0.05 NoStyrene VOC ppb 0.01 0.02 26 0.01 0.04 0.04 26 0.020.0004 Yes (fixed > micro)Toluene VOC ppb 0.53 0.33 26 0.13 1.35 0.88 26 0.340.0001 Yes (fixed > micro)Trichloroethylene VOC ppb 0 0.02 26 0.01 0 0.01 260 0.85 No(m+p)-xylenes VOC ppb 0.23 0.14 25 0.05 0.57 0.37 26 0.14 1.00E-04 Yes (fixed > micro)o-xylene VOC ppb 0.09 0.05 26 0.02 0.11 0.09 26 0.03 0.26 No1,2-Dichloroeenzene VOC ppb 0.01 0.06 26 0.02 0 0 26 -- 0.33 No1,2-Dichloroethane VOC ppb 0.01 0.02 26 0.01 0 0 26-- 0.15 No1,2-Dichloropropane VOC ppb 0.01 0.04 26 0.02 0 0 26 -- 0.33 No1,4-Dichlorobenzene VOC ppb 0.02 0.06 26 0.02 0.050.03 26 0.01 0.054 No1,2-Dibromoethane VOC ppb 0.01 0.04 26 0.02 0 0 26-- 0.33 No1,3-Butadiene VOC ppb 0.08 0.06 26 0.02 0.06 0.05 26 0.02 0.39 NoArsenic PM2.5ng/m30.48 0.65 38 0.21 0.5 0.66 37 0.21 0.94 NoCadmium PM2.5ng/m31.2 1.12 38 0.36 1.67 1.79 37 0.58 0.18 NoLead PM2.5ng/m33.73 2.46 38 0.78 6.16 6 37 1.93 0.03 Yes (fixed >micro)Chromium PM2.5ng/m31.18 1.24 38 0.39 1.27 3.5 37 1.13 0.88 NoManganese PM2.5ng/m32.83 2.1 38 0.67 3.1 2.63 37 0.85 0.62 NoVanadium PM2.5ng/m31.05 0.87 38 0.28 3.17 2.36 37 0.76 5.99E-06 Yes (fixed > micro)Nickel PM2.5ng/m31.47 2.56 38 0.81 1.53 1.61 37 0.52 0.91 NoCopper PM2.5ng/m38.5 5.86 38 1.86 16.29 5.12 37 1.65 4.13E-08 Yes (fixed > micro)Elemental Carbon PM2.5μg/m30.79 0.46 39 0.14 1.21 0.83 37 0.27 8.00E-03 Yes (fixed > micro)Arsenic TSP ng/m30.54 0.54 35 0.18 0.56 0.48 37 0.15 0.87 NoCadmium TSP ng/m31.51 0.87 35 0.29 1.61 0.74 37 0.24 7.43E-09 Yes (fixed > micro)Lead TSP ng/m35.85 2.6 35 0.86 9.61 7.03 37 2.27 0 Yes (fixed >micro)Chromium TSP ng/m32.99 2.12 35 0.7 3.55 2.48 37 0.8 0.3 NoManganeseTSPng/m356.5834.633511.4838.7122.43377.230.01Yes (micro > fixed)Vanadium TSP ng/m34.3 2.89 35 0.96 5.53 3.25 37 1.05 0.1 NoNickel TSP ng/m32.09 1.2 35 0.4 3.67 4.39 37 1.42 0.04 Yes (fixed> micro)Copper TSP ng/m315.45 6.76 35 2.24 26.85 10.9 37 3.51 1.34E-06 Yes(fixed > micro)Hexavalent Chromium TSP ng/m30.12 0.09 35 0.03 0.32 0.41 38 0.13 0.01 Yes (fixed > micro)Elemental Carbon PM10μg/m31.06 0.49 34 0.17 1.92 1.16 34 0.39 2.00E-04 Yes (fixed > micro)Manganese showed higher levels in PM10at Indio. Manganese levels are in general higherin the eastern portion of the District, and mayreflect contributions from geologic sources. No difference was found in PM2.5levels.MATES IIIFinal Report5-6Table 5-3.Comparison of Observed Concentrations for the Microscale and Fixed Site Pair of San Bernardino and Inland Valley SanBernardinoMicroscale SiteSan BernardinoFixed SiteInland Valley San Bernardino StatisticallyPollutant Category Units AVG S.D. N 95%CI AVG S.D.N 95%CI P-Value Significant?AcetaldehydeVOCppb2.231.44410.441.250.81440.240.0003Yes (micro > fixed)Acetone VOC ppb 2.38 2.82 41 0.86 1.58 1.04 44 0.310.09 NoBenzeneVOCppb0.730.38450.110.510.28460.080.013Yes (micro > fixed)Carbon TetrachlorideVOCppb0.080450.0010.070.01460.0036.45E-06Yes (micro > fixed)Chloroethene (Vinyl Chloride) VOC ppb 0 0 45 -- 0 046 -- -- --Chloroform VOC ppb 0.03 0.01 44 0 0.03 0.01 45 0 0.9 NoEthylbenzene VOC ppb 0.27 0.16 45 0.05 0.22 0.14 460.04 0.10 NoFormaldehydeVOCppb3.371.79410.552.381.56440.460.008Yes (micro > fixed)Methyl Ethyl KetoneVOCppb0.420.33410.10.280.17440.050.02Yes (micro > fixed)Methyl Tertiary Butyl Ether VOC ppb 0.05 0.04 44 0.01 0.01 0.02 46 0 6.05E-09 Yes (micro > fixed)Methylene ChlorideVOCppb0.240.18450.050.160.11460.031.00E-02Yes (micro > fixed)Perchloroethylene VOC ppb 0.04 0.03 45 0.01 0.04 0.03 46 0.01 0.39 NoStyrene VOC ppb 0.1 0.09 45 0.03 0.08 0.07 46 0.020.43 NoTolueneVOCppb2.511.63450.481.731.15460.330.01Yes (micro > fixed)Trichloroethylene VOC ppb 0.02 0.07 45 0.02 0.01 0.01 46 0 0.6 No(m+p)-xylenes VOC ppb 0.98 0.61 45 0.18 0.82 0.54 46 0.16 0.20 Noo-xyleneVOCppb0.350.23450.070.190.14460.040.0002Yes (micro > fixed)1,2-Dichlorobenzene VOC ppb 0 0 45 -- 0 0 46 -- ----1,2-Dichloroethane VOC ppb 0.01 0.01 45 0.00191 0 046 -- 1.95E-09 Yes (micro > fixed)1,2-Dichloropropane VOC ppb 0 0 45 -- 0 0 46 -- ----1,4-Dichlorobenzene VOC ppb 0.07 0.05 45 0.02 0.030.02 46 0.01 2.69E-05 Yes (micro > fixed)1,2-Dibromoethane VOC ppb 0.01 0.08 45 0.02 0 0 46-- 0.32 No1,3-Butadiene VOC ppb 0.12 0.08 45 0.02 0.1 0.06 460.02 0.13 NoArsenic PM2.5ng/m31.24 0 11 0 1.24 0 11 0 0.28 NoCadmium PM2.5ng/m31.46 0.5 11 0.3 2.14 1.57 11 0.93 0.19 NoLead PM2.5ng/m33.72 3.08 11 1.82 9.92 14.28 11 8.44 0.19 NoChromium PM2.5ng/m31.35 0.37 11 0.22 2.59 3.3 11 1.95 0.24 NoManganese PM2.5ng/m33.15 2.62 11 1.55 5.41 3.39 11 2 0.09 NoVanadium PM2.5ng/m31.35 0.37 11 0.22 1.35 0.37 11 0.22 0.99 NoNickel PM2.5ng/m31.24 0 11 0 1.58 0.8 11 0.47 0.19 NoCopper PM2.5ng/m315.99 6.88 11 4.07 22.65 16.01 11 9.46 0.23 NoElemental Carbon PM2.5μg/m31.42 1.01 11 0.59 1.67 1.07 11 0.63 0.4 NoArsenic TSP ng/m30.74 0.68 43 0.2 0.64 0.53 42 0.16 0.44 NoCadmium TSP ng/m31.37 0.59 43 0.18 1.6 0.85 42 0.26 0.13 NoLead TSP ng/m312.48 8.2 43 2.45 12.2 9.34 42 3.23 0.89 NoChromium TSP ng/m34.59 3.27 43 0.98 4.56 3.96 42 1.2 0.97 NoManganese TSP ng/m337.11 22.53 43 6.73 40.07 30.73 42 9,29 0.62 NoVanadium TSP ng/m33.93 4.03 43 1.2 4.49 5.04 42 1.52 0.57 NoNickel TSP ng/m32.93 2.12 43 0.63 3.03 2.84 42 0.86 0.85 NoCopper TSP ng/m332.93 14.54 43 4.34 40.2 24.21 42 7.32 0.10 NoHexavalent Chromium TSP ng/m30.2 0.09 51 0.03 0.21 0.1 48 0.03 0.89 NoElemental Carbon PM10μg/m32.75 1.13 46 0.33 2.47 1.22 43 0.37 0.27 NoSan Bernardino showed higher levels of several pollutants associated with vehicle emissions, includingbenzene, 1,3-butadiene, toluene andaldehydes, and may reflect the influence of nearbytraffic. Also the solvents methyl ethyl ketone andmethylene chloride were higher.MATES IIIFinal Report5-7Table 5-4.Comparison of Observed Concentrations for the Microscale and Fixed Site Pair of Sun Valley and BurbankMicroscale Site - Sun ValleyFixed Site - Burbank StatisticallyPollutant Category Units AVG S.D. N 95%CI AVG S.D.N 95%CI P-Value Significant?Acetaldehyde VOC ppb 1.74 0.79 96 0.16 2.01 0.85 100 0.17 0.02 Yes (fixed > micro)Acetone VOC ppb 2.35 2.04 96 0.41 1.86 2.5 100 0.490.13 NoBenzene VOC ppb 0.52 0.23 91 0.05 0.75 0.46 101 0.09 2.29E-05 Yes (fixed > micro)Carbon Tetrachloride VOC ppb 0.07 0.01 91 0.0018 0.09 0.01 101 0.0017 3.08E-28 Yes (fixed > micro)Chloroethene (Vinyl Chloride) VOC ppb 0 0 91 0 0 0101 0 0.7 NoChloroform VOC ppb 0.04 0.02 91 0 0.05 0.03 101 0.01 0.002 Yes (fixed > micro)Ethylbenzene VOC ppb 0.22 0.11 91 0.02 0.38 0.26 101 0.05 1.57E-07 Yes (fixed > micro)Formaldehyde VOC ppb 4.04 1.82 96 0.36 3.96 1.68 100 0.33 0.74 NoMethyl Ethyl Ketone VOC ppb 0.3 0.17 96 0.03 0.3 0.22 100 0.04 0.96 NoMethyl Tertiary Butyl Ether VOC ppb 0.03 0.03 91 0.01 0 0.01 101 0 1.09E-12 Yes (micro > fixed)Methylene Chloride VOC ppb 0.29 0.15 91 0.03 0.37 0.35 101 0.07 0.050 NoPerchlororoethylene VOC ppb 0.09 0.06 91 0.01 0.1 0.1 101 0.02 0.48 NoStyrene VOC ppb 0.16 0.15 28 0.05 0.24 0.17 30 0.060.06 NoToluene VOC ppb 1.77 0.86 91 0.18 2.69 1.76 101 0.34 8.03E-06 Yes (fixed > micro)Trichloroethylene VOC ppb 0.03 0.03 91 0.01 0.02 0.03 101 0.01 0.34 No(m+p)-xylenes VOC ppb 0.86 0.47 90 0.1 1.35 0.93 101 0.18 5.77E-06 Yes (fixed > micro)o-xylene VOC ppb 0.27 0.14 91 0.03 0.35 0.37 101 0.07 0.03 Yes (fixed > micro)1,2-Dichlorobenzene VOC ppb 0 0 91 -- 0 0.01 101 00.04 Yes fixed (>micro)1,2-Dichloroethane VOC ppb 0.01 0.01 91 0.0011 0 0101 0.0004 2.6E-16 Yes (micro > fixed)1,2-Dichloropropane VOC ppb 0 0 91 -- 0 0 101 0 0.32 No1,4-Dichlorobenzene VOC ppb 0.03 0.02 91 0 0.03 0.02 101 0 0.78 No1,2-Dibromoethane VOC ppb 0 0 91 -- 0 0 101 -- -- --1,3-ButadieneVOCppb0.220.17910.040.130.131010.032.75E-05Yes (micro > fixed)Arsenic PM2.5ng/m30.22 0.48 110 0.09 0.3 0.66 108 0.12 0.29 NoCadmium PM2.5ng/m31.3 1.59 110 0.3 1.45 2.26 108 0.43 0.57 NoLead PM2.5ng/m35.06 4.76 110 0.89 4.94 3.81 108 0.72 0.84 NoChromium PM2.5ng/m35.87 21.56 110 4.03 3.77 16.37 108 3.09 0.41 NoManganese PM2.5ng/m33.82 7.62 110 1.42 3.11 6.37 108 1.2 0.45 NoVanadium PM2.5ng/m32.88 2.84 110 0.53 3.94 4.07 108 0.77 0.03 Yes (fixed > micro)Nickel PM2.5ng/m33.46 5.72 110 1.07 3.45 4.88 108 0.92 0.99 NoCopper PM2.5ng/m316.16 5.79 110 1.08 26.72 12.55 108 2.37 1.87E-13Yes (fixed > micro)Elemental Carbon PM2.5μg/m31.83 0.91 109 0.17 2.18 1.27 111 0.24 0.02 Yes (fixed > micro)Arsenic TSP ng/m30.6 0.53 84 0.11 0.72 0.58 81 0.13 0.18 NoCadmium TSP ng/m31.62 0.92 84 0.2 1.46 0.79 81 0.17 0.21 NoLead TSP ng/m39.05 6.44 84 1.38 10.09 5.41 81 1.18 0.26 NoChromium TSP ng/m32.42 1.81 84 0.39 4.41 3.43 81 0.75 8.40E-06 Yes (fixed > micro)Manganese TSP ng/m323.52 13.94 84 2.98 23.58 16.35 81 3.56 0.98 NoVanadium TSP ng/m34.32 3.81 84 0.82 5.28 4.37 81 0.9 0.13 NoNickel TSP ng/m32.57 1.81 84 0.39 3.66 2.07 81 0.45 0.00 Yes (fixed > micro)Copper TSP ng/m351.51 26.68 84 5.71 50.28 24.98 81 5.44 0.76 NoHexavalent ChromiumTSPng/m30.170.171220.030.130.11260.020.01Yes (micro > fixed)Elemental Carbon PM10μg/m32.01 0.87 97 0.17 2.33 1.14 99 0.22 0.03 Yes (fixed > micro)The Sun Valley site showed higher levels of hexavalent chromium than Burbank. This may reflect the nearby use of hexavalent chromiumsuch as plating operations. Also the level of 1,3-butadiene was relatively higher.MATES IIIFinal Report5-8Table 5-5.Comparison of Observed Concentrations for the Microscale and Fixed Site Pair of Santa Ana and AnaheimMicroscale Site - Santa AnaFixed Site - Anaheim StatisticallyPollutant Category Units AVG S.D. N 95%CI AVG S.D.N 95%CI P-Value Significant?Acetaldehyde VOC ppb 1.87 0.91 47 0.26 1.62 0.67 500.19 0.12 NoAcetone VOC ppb 1.82 1.92 47 0.55 2.61 3.01 50 0.830.13 NoBenzeneVOCppb1.040.6470.170.610.4460.128.77E-05Yes (micro > fixed)Carbon Tetrachloride VOC ppb 0.07 0.01 47 0.0019 0.09 0.01 46 0.0026 4.35E-14 Yes (fixed > micro)Chloroethene Vinyl Chloride VOC ppb 0 0 47 -- 0 0 46 -- -- --Chloroform VOC ppb 0.04 0.02 47 0.01 0.04 0.02 46 0.01 0.3 NoEthylbenzeneVOCppb0.450.29470.080.310.25460.070.01Yes (micro > fixed)Formaldehyde VOC ppb 3.66 1.44 47 0.41 3.56 1.47 500.41 0.73 NoMethyl Ethyl Ketone VOC ppb 0.21 0.15 47 0.04 0.220.14 50 0.04 0.61 NoMethyl Tertiary Butyl Ether VOC ppb 0.03 0.02 47 0.01 0 0.01 46 0 2.21E-08 Yes (micro > fixed)Methylene Chloride VOC ppb 0.8 2.31 47 0.66 0.31 0.2 45 0.06 0.15 NoPerchloroethylene VOC ppb 0.07 0.05 47 0.02 0.08 0.08 46 0.02 0.62 NoStyrene VOC ppb 0.13 0.16 47 0.05 0.58 1.01 46 0.290.005 Yes (fixed > micro)TolueneVOCppb3.252.01470.572.181.66460.010.01Yes (micro > fixed)TrichloroethyleneVOCppb0.020.02470.0060.010.02460.0050.001Yes (micro > fixed)(m+p)-xylenesVOCppb1.821.29470.371.020.81460.236.00E-04Yes (micro > fixed)o-xyleneVOCppb0.60.41470.120.330.34460.19.00E-04Yes (micro > fixed)1,2-Dichloro Benzene VOC ppb 0 0 47 -- 0 0 46 0 0.32 No1,2-Dichloro Ethane VOC ppb 0.01 0.01 47 0 0 0 46 -- 3.5E-13 Yes (micro > fixed)1,2-Dichloro Propane VOC ppb 0 0 47 -- 0 0 46 0 0.32 No1,4-Dichloro BenzeneVOCppb0.070.05470.0150.020.02460.0064.44E-07Yes (micro > fixed)1,2-Dibromo Ethane VOC ppb 0 0 47 -- 0 0 46 -- -- --1,3-ButadieneVOCppb0.50.39470.110.080.09460.022.19E-09Yes (micro > fixed)Arsenic PM2.5ng/m30.18 0.38 62 0.09 0.3 0.59 64 0.14 0.15 NoCadmium PM2.5ng/m31.39 1.71 62 0.42 1.71 2.2 64 0.54 0.37 NoLead PM2.5ng/m33.88 3.44 62 0.86 3.74 2.54 64 0.62 0.79 NoChromium PM2.5ng/m313.67 35.61 62 8.86 6.11 19.24 64 4.71 0.14 NoManganese PM2.5ng/m35.59 11.61 62 2.89 3.28 6.58 64 1.61 0.18 NoVanadium PM2.5ng/m37.18 5.56 62 1.38 7.46 5.29 64 1.3 0.78 NoNickel PM2.5ng/m37.34 10.64 62 2.65 5.81 6.59 64 1.61 0.34 NoCopperPM2.5ng/m318.6211.65622.914.57.56641.850.02Yes (micro > fixed)Elemental Carbon PM2.5μg/m31.9 1.24 63 0.31 1.92 1.3 64 0.32 0.95 NoArsenic TSP ng/m30.47 0.42 52 0.12 0.42 0.37 57 0.1 0.56 NoCadmium TSP ng/m32.1 3.25 52 0.88 1.54 0.84 57 0.22 0.23 NoLead TSP ng/m38.28 8.98 52 2.44 7.66 7.57 57 1.97 0.7 NoChromium TSP ng/m32.8 2.51 52 0.68 2.77 2.54 57 0.66 0.96 NoManganese TSP ng/m322.73 19.33 52 5.25 21.12 14.82 57 3.85 0.63 NoVanadium TSP ng/m312.73 21.12 52 5.74 9.26 5.48 57 1.42 0.26 NoNickel TSP ng/m35.16 6.37 52 1.73 4.4 2.05 57 0.53 0.42 NoCopper TSP ng/m345.73 34.51 52 9.38 40.8 22.08 57 5.73 0.38 NoHexavalent Chromium TSP ng/m30.12 0.09 60 0.02 0.12 0.08 62 0.02 0.78 NoElemental Carbon PM10μg/m31.87 0.98 53 0.26 1.91 1.17 60 0.3 0.84 NoSeveral pollutants associated with vehicle emissions, including benzene, 1,3-butadiene, toluene, xylene and ethylbenzene show relativelyhigher levels at the Santa Ana site compared to Anaheim. This likely reflects the influence of nearbytraffic. Copper in PM2.5was alsohigher, but copper was not higher in PM10.