Characterization of Wintertime Reactive Oxygen Species Concentrations in Flushing, New York

Figures & data

Figure S1 Calibration curve of the measured fluorescence of standard H2O2 solutions, where M is the molarity of the solution.

TABLE 1 ROS concentrations over the various size fractions of the Flushing aerosol, during the four sampling periods

	Equivalent H2O2 Concentrations in nanomoles/m^3
	8–11 A.M.			12–3 P.M.			4–7 P.M.			9 P.M.–12 A.M.
Size interval (μ m)	Range	Mean	SD	Range	Mean	SD	Range	Mean	SD	Range	Mean	SD
> 18	0.048–0.144	0.091	0.031	0.065–0.148	0.11	0.025	0.048–0.161	0.084	0.026	0.041–0.123	0.073	0.024
10–18	0.034–0.120	0.069	0.023	0.054–0.126	0.089	0.023	0.041–0.171	0.084	0.033	0.035–0.09	0.059	0.016
5.6–10	0.036–0.129	0.071	0.025	0.054–0.144	0.086	0.025	0.038–0.104	0.065	0.024	0.039–0.100	0.063	0.019
2.5–5.6	0.038–0.114	0.074	0.019	0.053–0.134	0.085	0.024	0.035–0.116	0.073	0.024	0.035–0.101	0.061	0.019
1.8–2.5	0.039–0.100	0.069	0.019	0.044–0.124	0.076	0.024	0.036–0.110	0.07	0.024	0.031–0.104	0.054	0.019
1.0–1.8	0.038–0.135	0.068	0.024	0.036–0.111	0.075	0.024	0.034–0.109	0.073	0.024	0.035–0.111	0.065	0.021
0.56–1.0	0.036–0.089	0.063	0.016	0.04–0.151	0.083	0.029	0.033–0.245	0.086	0.051	0.036–0.113	0.059	0.023
0.32–0.56	0.050–0.126	0.079	0.025	0.043–0.145	0.093	0.026	0.036–0.111	0.061	0.023	0.034–0.101	0.058	0.019
0.18–0.32	0.040–0.099	0.064	0.015	0.036–0.138	0.078	0.033	0.040–0.099	0.064	0.018	0.036–0.113	0.065	0.021
0.10–0.18	0.054–0.086	0.069	0.009	0.033–0.109	0.076	0.024	0.035–0.114	0.068	0.028	0.030–0.090	0.058	0.018
0.056–0.10	0.049–0.100	0.07	0.015	0.061–0.106	0.083	0.024	0.059–0.116	0.08	0.021	0.046–0.128	0.075	0.023
0.032–0.056	0.093–0.168	0.131	0.024	0.121–0.171	0.143	0.018	0.1–0.146	0.118	0.016	0.086–0.163	0.121	0.023
0.018–0.032	0.089–0.181	0.115	0.024	0.100–0.174	0.14	0.024	0.104–0.150	0.125	0.013	0.089–0.168	0.121	0.023
0.010–0.018	0.100–0.178	0.118	0.021	0.100–0.164	0.126	0.015	0.104–0.189	0.129	0.021	0.093–0.174	0.125	0.021
Sample Size	14			15			14			14
Avg. Total ROS Conc.	1.149			1.338			1.176			1.056
Std. Dev.	0.1099			0.1109			0.1528			0.1618
Range	0.926–1.35			1.178–1.525			1.011–1.425			0.88–1.45

FIG. 1 Diurnal variations of (a) mean total particulate ROS concentrations and (b) mean stagewise ROS concentrations.

Figure S2 (a) Stagewise concentration distribution curve, and (b) scatter plot of the total ROS concentration in the Nano-MOUDI stages versus the total ROS concentration in the MOUDI stages.

FIG. 2 Regression graphs showing correlation between mean ozone concentrations and mean total particulate ROS concentrations during the three daytime sampling periods.

Figure S3 Regression graphs showing correlation between measured EC concentrations and mean total particulate ROS concentrations during the sampling periods.

Figure S4 Regression graphs showing correlation between measured OC concentrations and mean total particulate ROS concentrations during the sampling periods.

FIG. 3 Regression graphs showing correlation between estimated SOC concentrations and mean total particulate ROS concentrations during the sampling periods.

FIG. 4 Scatter plot of mean total particulate ROS with gas phase OH and HO₂ radical concentrations over the period of sampling.

Table

ROS Conc. in nanomoles/m^3	Ozone in ppb
0.926	1
1.086	2
1.128	2.7
1.08	3.1
1.214	7.7
1.011	8
1.018	9
1.178	9.5
1.263	9.7
1.3	11.4
1.16	11.5
1.105	12
1.388	12
1.3	12.4
1.075	12.5
1.425	12.8
1.121	13.5
1.193	15.4
1.115	15.8
1.015	15.8
1.156	16.7
1.263	16.9
1.106	17
1	17.9
1.123	17.9
1.223	18.4
1.4	18.6
1.053	19.4
1.275	19.9
1.275	21
1.2	23
1.3	23.1
1.313	23.1
1.525	23.3
1.23	23.6
1.5	23.6
1.388	24.5
1.263	24.6
1.338	25.1
1 513	26.6

Table

Ozone in ppb
A: 0–10	B: 10–15	C: 15–20	D: 20–30
0.926	1.3	1.193	1.275
1.086	1.16	1.115	1.2
1.128	1.105	1.015	1.3
1.075	1.388	1.156	1.313
1.214	1.3	1.263	1.525
1.011	1.075	1.106	1.23
1.018	1.425	1	1.5
1.178	1.121	1.123	1.388
1.263		1.223	1.263
		1.4	1.338
		1.053	1.513
		1.275

Table

Single factor ANOVA
Source of variance	F ratio	P value	Critical F ratio (α = 0.05)
Between groups	8.46	0.000219	2.866

Table

SOC Conc. in μg/m^3
A: < 0.55	B: 0.55–1.1	C: > 1.1
1.313	1.400	1.425
1.338	1.350	1.018
1.000	1.388	1.086
1.193	1.500	1.128
1.156	1.223	1.425
1.121	1.178	0.926
1.075	1.275	1.300
1.011	1.513	1.300
1.123	1.263	1.525
1.105	1.160	1.388
1.275	1.300	1.214
1.230	1.106	1.388
1.263	1.263
1.075
1.200

Table

Single factor ANOVA
Source of variance	F-ratio	P value	Critical F-ratio (α = 0.05)
Between groups	3.54	0.039	3.25

Table

EC Conc. in μg/m^3
A: < 0.45	B: 0.45–0.70	C: 0.7–1.5	D: > 1.5
0.959	1.223	1.214	0.926
0.880	1.300	1.500	1.075
1.200	1.400	1.388	1.388
1.123	1.075	0.938	1.350
1.086	1.106	1.121	1.128
1.263	1.018	1.263	1.000
1.425	1.178	1.300	0.975
1.513	1.275	0.909	1.086
1.230	1.190	1.105	1.156
1.275	1.240	1.263	1.338
1.070	1.056	1.160	1.193
0.933	1.525	0.924	1.388
	1.300	1.011	1.313
			1 475

Table

Single factor ANOVA
Source of variance	F-ratio	P value	Critical F-ratio (α = 0.05)
Between groups	0.36	0.78	2.79

Table

OC Conc. in μg/m^3
A: < 1.1	B: 1.1–1.8	C: 1.8–2.6	D: > 2.6
0.959	1.400	1.070	1.525
1.450	1.121	1.425	1.263
1.123	1.223	1.263	1.350
1.086	0.933	1.018	0.924
0.880	1.178	1.105	0.938
1.015	1.275	1.053	0.909
1.000	1.185	1.193	1.214
1.075	1.313	1.240	0.926
1.230	1.500	1.011	1.128
1.200	1.190	1.300	1.086
1.275	1.106	1.300	1.388
1.338	1.388	1.300	1.425
1.513	1.156	1.160	1.388
1.263	1.056	0.975
		1.075

Table

Single factor ANOVA
Source of variance	F-ratio	P value	Critical F-ratio (α = 0.05)
Between groups	0.24	0.86	2.78

Table

OH Conc. in ppt
A: 0–0.0095	B: 0.0095–0.025	C: 0.025–0.04	D: 0.04–0.08
1.056	1.4	1.121	1.193
1.45	1.015	1.3	1.35
1.086	1.223	1.2	1.338
1.07	1.053	1.086	1.263
1.263	1.075	1.105	1.275
0.938	1.185	1.313	1.16
1.3	0.909	1.525	1.5
0.975	1.24	1.23	1.513
1.018	1	1.425	1.3
0.933	1.388	1.388	1.388
1.19	1.214	1.178	1.263
0.88	1.425	1.128
1.123	1.106	0.926
1.011	1.075	1.275
0.959	1.115	1.156
0.924

Table

Single factor ANOVA
Source of variance	F-ratio	P value	Critical F-ratio (α = 0.05)
Between groups	6.661	0.00067	2.779

Table

HO2 Conc. in ppt
A: < 0.25	B: 0.25–0.5	C: > 0.5
1.056	1.223	1.525
1.45	1.185	1.128
1.086	1.3	1.425
0.88	1.121	1.106
0.938	1.388	1.3
1.123	0.933	1.156
1.19	1.086	1.193
0.975	1.115	1.178
1.263	1.214	1.275
0.959	1.075	1.338
1.07	0.926	1.313
1.015	1.2	1.275
1.053	1.105	1.5
1.24	1	1.263
0.924	1.23	1.388
1.4	1.075	1.3
1.018	1.388	1.16
1.011		1.263
		1.513

Table

Single factor ANOVA
Source of variance	F-ratio	P value	Critical F-ratio (α = 0.05)
Between groups	10.036	0.000211	3.179

Table

(OH + HO2) Conc. in ppt
A: < 0.3	B: 0.3–0.5	C: > 0.5
1.056	1.185	1.388
1.45	1.3	1.106
1.086	1.388	1.525
0.88	1.121	1.425
0.938	0.933	1.128
1.123	1.115	1.3
0.975	1.086	1.156
1.19	1.075	1.193
1.263	1.214	1.178
0.959	1.2	1.275
1.07	1	1.313
1.015	1.105	1.338
1.053	0.926	1.275
1.24	1.23	1.263
0.924	1.075	1.5
1.018		1.388
1.4		1.3
1.011		1.16
1.223		1.263
		1.513

Table

Single factor ANOVA
Source of variance	F-ratio	P value	Critical F-ratio (α = 0.05)
Between groups	10.036	0.000211	3.179