Development and evaluation of a mobile laboratory for collecting short-duration near-road fine and coarse ambient particle and road dust samples

Figures & data

Figure 1. (a) Front/side MPCP view, and (b) Back view of MPCP

Figure 2. Mobile Particle Concentrator Platform schematic views (back, inside front, and top)

Figure 3. (a) RDA left side view, (b) RDA right side view

Figure 4. RDA sampler schematic

Table 1. Harvard ambient fine particle concentrator (PM_0.2–2.5)

PM2.5	Number of Pairs	Average CAPs (SD) (µg/m^3)	Range (min – max)	Average LOD (µg/m^3)	RMSE	δ (%)
Mass	5	30.1 (12.2)	15.6–44.5	-	0.900	3
Mg	3	0.115 (0.035)	0.070–0.145	0.049	0.011	10*
Al	5	0.459 (0.156)	0.269–0.628	0.056	0.019	4
Si	5	0.626 (0.343)	0.170–1.169	0.017	0.031	5
S	5	1.286 (0.528)	0.598–1.907	0.011	0.061	5
Cl	5	0.320 (0.207)	0.020–0.534	0.006	0.016	5
K	5	0.227 (0.108)	0.092–0.403	0.006	0.012	5
Ca	5	0.296 (0.122)	0.119–0.428	0.007	0.014	5
Ti	5	0.060 (0.031)	0.033–0.112	0.003	0.005	8
V	3	0.003 (0.001)	0.003–0.004	0.001	0.001	36*
Mn	3	0.018 (0.003)	0.018–0.020	0.005	0.003	18*
Fe	5	0.769 (0.372)	0.352–1.274	0.015	0.036	5
Co	3	0.003 (0.001)	0.003–0.004	0.002	0.001	24*
Cu	5	0.044 (0.017)	0.026–0.072	0.010	0.004	9
Zn	5	0.126 (0.062)	0.064–0.203	0.005	0.007	5
Br	3	0.010 (0.003)	0.007–0.012	0.003	0.001	14*
Ag	3	0.013 (0.001)	0.013–0.014	0.010	0.001	7*
Sn	3	0.019 (0.003)	0.016–0.023	0.014	0.002	9*

Asterisk (*) - RMSE is based on fewer sample pairs.

Table 2. Harvard ambient coarse particle concentrator (PM_2.5–10)

PM10-2.5	Number of pairs	Average CAPs (SD) (µg/m^3)	Range (min – max)	Average LOD (µg/m^3)	RMSE	δ (%)
Mass	5	240.9 (110.5)	144.1–423.8	-	8.500	4
Na	4	3.137 (3.150)	0.440–8.179	0.262	0.085	3*
Mg	5	1.205 (0.775)	0.328–2.447	0.162	0.112	9
Al	5	6.304 (3.854)	2.288–13.398	0.155	0.352	6
Si	5	14.890 (9.577)	5.290–32.650	0.135	0.841	6
S	5	1.528 (0.705)	0.620–2.656	0.016	0.065	4
Cl	5	5.086 (6.121)	0.287–15.980	0.052	0.297	6
K	5	2.663 (1.323)	1.410–5.110	0.017	0.150	6
Ca	5	7.460 (4.605)	2.878–15.579	0.056	0.271	4
Ti	5	0.895 (0.456)	0.478–1.578	0.010	0.041	5
V	3	0.030 (0.014)	0.020–0.039	0.002	0.001	5*
Cr	4	0.038 (0.018)	0.018–0.056	0.004	0.001	4*
Mn	5	0.160 (0.077)	0.067–0.289	0.014	0.016	10
Fe	5	10.863 (5.683)	5.456–19.967	0.083	0.604	6
Co	4	0.023 (0.011)	0.019–0.040	0.003	0.002	10*
Ni	3	0.013 (0.005)	0.010–0.018	0.003	0.001	7*
Cu	5	0.390 (0.195)	0.192–0.654	0.019	0.020	5
Zn	5	0.328 (0.155)	0.182–0.551	0.010	0.014	4
Br	4	0.032 (0.015)	0.021–0.062	0.010	0.002	7*
Sr	4	0.060 (0.022)	0.038–0.110	0.007	0.005	8*
Zr	4	0.168 (0.072)	0.089–0.262	0.013	0.013	8*
Sn	4	0.078 (0.030)	0.053–0.110	0.026	0.010	13*
Ba	4	0.772 (0.403)	0.321–1.190	0.107	0.083	11*

Asterisk (*) - RMSE is based on fewer sample pairs.

Table 3. Road dust aerosolizer – PM_10.

PM10	Number of pairs	Average Mass Fraction (SD)	Range (min – max)	Average LOD	RMSE	δ (%)
Mass (mg/filter)	8	7.78 (5.42)	2.12–19.36	-	0.520	7
Elements (µg/mg)
Al	8	22.22 (14.05)	7.81–43.48	0.308	1.171	5
Si	8	57.27 (31.36)	23.15–104.63	0.452	2.816	5
S	8	3.53 (2.44)	0.90–7.01	0.027	0.140	4
Cl	8	4.37 (1.35)	2.41–6.00	0.045	0.121	3
K	8	9.83 (2.15)	6.98–12.60	0.039	0.300	3
Ca	8	16.29 (4.31)	12.58–27.17	0.110	0.413	3
Ti	8	3.80 (0.27)	3.34–4.11	0.023	0.092	2
V	8	0.14 (0.03)	0.11–0.20	0.003	0.006	4
Cr	8	0.29 (0.04)	0.23–0.35	0.006	0.010	4
Mn	8	0.79 (0.14)	0.71–1.16	0.017	0.011	1
Fe	8	53.64 (4.80)	46.14–63.56	0.336	1.614	3
Co	8	0.12 (0.03)	0.08–0.16	0.005	0.007	6
Ni	8	0.11 (0.01)	0.10–0.14	0.005	0.010	9
Cu	7	0.44 (0.15)	0.26–0.63	0.017	0.026	6
Zn	7	1.42 (0.65)	1.04–3.01	0.019	0.029	2
Rb	8	0.067 (0.01)	0.05–0.08	0.007	0.006	9
Sr	8	0.16 (0.03)	0.11–0.23	0.011	0.009	5
Zr	8	0.24 (0.04)	0.20–0.33	0.019	0.011	5
Ba	7	0.79 (0.30)	0.50–1.43	0.109	0.063	8
Pb	6	0.23 (0.11)	0.04–0.39	0.017	0.025	11*

Table 4. Road Dust Aerosolizer - PM_2.5

PM2.5	Number of pairs	Average Mass Fraction (SD) (µg/mg)	Range (min – max)	Average LOD	RMSE	δ (%)
mass (mg/filter)	8	1.56 (1.18)	0.45 - 3.80	-	0.050	3
Elements (ug/mg)
Mg	8	4.06 (2.72)	1.86 - 9.10	0.71	0.32	8
Al	7	35.02 (13.05)	22.01 - 52.80	0.73	1.38	4
Si	7	82.90 (24.70)	59.18 - 116.77	0.68	3.36	4
S	8	5.00 (2.76)	1.41 - 8.83	0.06	0.19	4
Cl	8	5.66 (2.19)	2.78 - 8.92	0.08	0.25	4
K	8	12.13 (1.27)	10.57 - 14.46	0.08	0.33	3
Ca	8	19.24 (6.81)	13.47 - 36.29	0.16	0.45	2
Ti	8	4.10 (0.37)	3.30 - 4.60	0.04	0.11	3
V	8	0.14 (0.04)	0.08 - 0.23	0.01	0.01	10
Cr	8	0.45 (0.07)	0.34 - 0.53	0.03	0.01	2
Mn	8	0.88 (0.21)	0.72 - 1.42	0.07	0.04	5
Fe	8	60.33 (6.43)	48.44 - 71.52	0.44	0.95	2
Co	7	0.13 (0.04)	0.05 - 0.17	0.02	0.01	6
Ni	8	0.18 (0.04)	0.14 - 0.26	0.02	0.02	9
Cu	8	0.64 (0.20)	0.34 - 0.88	0.08	0.07	11
Zn	8	1.85 (0.90)	1.14 - 4.09	0.05	0.05	3
Sr	7	0.17 (0.03)	0.13 - 0.22	0.05	0.02	13
Zr	8	0.27 (0.05)	0.19 - 0.37	0.09	0.03	12
Pb	4	0.26 (0.07)	0.16 - 0.35	0.06	0.02	7*