Feasibility of using low-cost portable particle monitors for measurement of fine and coarse particulate matter in urban ambient air

Figures & data

Table 1. Summary of statistics for measured ambient temperature, relative humidity, and particle sampling results for the DC 1700 and the Grimm11-R.

Description		n	Mean ± SD	Median	Range
DC 1700^a	Particle number(PN2.5-0.5)	8,330	1,896 ± 1,935	1,633	30–36,400
	Particle number(PN>2.5)	8,330	103 ± 223	38	1–5,435
Grimm11-R^b	Fine PM (PM2.5)	8,330	11.3 ± 15.1	8.7	0.2–318.7
	Coarse PM(PM10-2.5)	8,330	4.8 ± 16.5	0.8	0–378.7
HOBO^c	Temperature	8,330	14.0 ± 5.6	12.1	6.3–29.3
	Relative humidity	8,330	63.2 ± 12.5	63	26.5–91.4

^aUnit for DC 1700 is particles/0.01 ft³.

^bUnit for Grimm 11-R is µg/m³.

^cUnit for temperature is ºC and relative humidity is percent.

Figure 1. Scatter plots of particle number count concentrations from the DC 1700 and PM mass concentrations from the Grimm 11-R. (a) Paired scatter plot (open circles) between the DC 1700 PM_2.5 particle number count concentrations (PN_2.5-0.5) and PM_2.5 mass concentrations from the Grimm 11-R. The linear regression (dashed line) equation is summarized at the top. (b) Paired scatter plot (open squares) between the DC 1700 coarse PM particle count concentrations (PN_>2.5) and the PM_10-2.5 mass concentrations from the Grimm 11-R. The regression equation is summarized at the top.

Figure 2. Comparison of 1-min average converted mass concentrations from the DC 1700 and measured Grimm 11-R PM mass concentrations. (a) Comparison of mass concentrations for PM_2.5. (b) Comparison of mass concentrations for coarse PM.

Figure 3. Diurnal patterns of mean relative humidity (bar graph) and mean ratios of 1-min paired DC 1700 to Grimm 11-R for both PM_2.5 (closed circles) and coarse PM (open squares).

Figure 4. Scatter plots of calculated PM mass concentrations from the DC 1700 vs. Grimm 11-R PM mass concentrations. (a) Paired scatter plots by three different mass median diameters (MMD, µm) between the DC 1700 PM_2.5 mass concentrations and PM_2.5 mass concentrations from the Grimm 11-R. (b) Paired scatter plots by three different mass median diameters (MMD, µm) between the DC 1700 coarse PM mass concentrations and the PM_10-2.5 mass concentrations from the Grimm 11-R. Each graph also shows the 1:1 (dashed) line.