Particle count and black carbon measurements at schools in Las Vegas, NV and in the greater Salt Lake City, UT area

Figures & data

Figure 1. Study locations: (a) Adcock Elementary School, Las Vegas, NV; (b) Hunter High School, Salt Lake City, UT.

Table 1. Measurements at Adcock Elementary and Hunter High School.

At Adcock	At Hunter	Instrument	Measurement (units)
X	X	Magee Scientific Aethalometer AE-22	Black carbon (µg/m^3)
X	X	Teledyne-API model 651 water-based condensation nuclei counter	Particles/cm^3
	X	Beta Attenuation Monitor (BAM 1020)	PM10 (μg/m^3)
X	X	R. M. Young 5305V	Wind speed (m/sec)
			Wind direction (degrees)
X	X	R. M. Young 41342VC	Temperature (degrees)
			Relative humidity (%)
X	X	LI-COR LI-200X	Solar radiation (W/m^2)
X		Thermo model 42i Chemiluminescence NO-NO2-NOx Analyzer	NO, NO2, NOx (ppb)
X		Radar detector	Vehicle speed and count by vehicle size

Note. Measurements reported for Adcock are for April 19–June 19, 2013, and measurements for Hunter are for February 9–February 24, 2012.

Table 2. Summary statistics of hourly particle concentration, BC, and PM₁₀ concentrations and wind speed at Adcock (April 19–June 19, 2013) and at Hunter (February 9–February 24, 2012).

Location	Statistic	Particles/cm^3	BC (μg/m^3)	Wind speed (m/sec)	PM10 (μg/m^3)
Adcock	Average	10981	0.52	1.84	n/a
	Median	10158	0.42	1.52	n/a
	Standard deviation	6887	0.34	1.25	n/a
	Number of samples	1017	1003	1014	n/a
Hunter	Average	6755	0.46	2.7	10.2
	Median	6310	0.33	2.6	7.0
	Standard deviation	3382	0.38	1.48	15.3
	Number of samples	367	360	336	256

Figure 2. Hourly averaged BC (µg/m³) and particle count (particles/cm³) concentrations at (a) Adcock Elementary, April 19–June 19, 2013 and (b) Hunter High, February 9–24, 2012.

Figure 3. Hourly concentrations of (a) BC (µg/m³) and (b) particle count (particles/cm³) at Adcock Elementary compared to traffic volume (vehicles/hr), colored by the number of large vehicles (those greater than 40 feet in length).

Figure 4. Wind speed (m/sec) at Adcock Elementary compared to hourly concentrations of (a) BC (µg/m³) (b) particle count (particles/cm³) and polar plots for (c) BC (µg/m³) and (d) particle count (particles/cm³).

Figure 5. Wind speed (m/sec) at Hunter High compared to hourly concentrations of (a) BC (µg/m³) and (b) particle count (particles/cm³), and polar plots for (c) BC (µg/m³) and (d) particle count (particles/cm³). The axis ranges for Figure 5a and 5b are the same as those in Figures 4a and 4b in order to aid comparison between figures.

Figure 6. Hourly measurements of particle count (particles/cm³), BC (µg/m³), NO_x (ppb, Adcock only), wind speed (m/sec), and RH (%) for (a) April 29 and 30, 2013, at Adcock (b) June 4 and 5, 2013, at Adcock and (c) February 19 and 20, 2012, at Hunter.