Table 1.

List of data measured, sampler, averaging time, analytical method and locations used during NEXUS.

Data measured	Sampler	Averaging time	Analytical method	Homes	Schools	I-96 sites (distance and direction from)
						10 m N	100 m N	300 m N	100 m S
PM2.5 mass, elements, black carbon (BC)	Harvard impactor (10 LPM)	24-h	GM, ED-XRF, ICP-MS, OT	I, O	X		X
Black carbon	Magee micro aethalometer AE51	1-min	IR absorption	I, O	X		X
Oxides of nitrogen (NO+NO2)	2B technologies 400/401	1-min	UV absorption	I, O	X		X
Carbon monoxide (CO)	Langan T15v	1-min	Electrochem.	I, O	X		X
Particle number	TSI P-Trak	1-min	CPC	I, O	Xe		Xe
PMcoarse elements	Leith–Wagner passive sampler	7-day	SEM		X	X	X	X	X
Air exchange rate	PFT source and receptor tubes	24-h	GC–MS	I
Mold in floor dust	MiTest	5-min	qPCR	I
Temperature and relative humidity	Onset U10-003	5-min	Thermocouple	I
PM2.5 organics	Tisch sampler (226 LPM)	3/dayc (1-in-2 day)	GC–MS		X		X		X
PM2.5 inorganics	Prototype sampler (113 LPM)	3/dayc (1-in-2 day)	GM, ED-XRF and ICP-MS		X		X
C2 to C14 VOCs	Summa canisters	6–10 am (1-in-2 day)	GC–MS		X		X
Wind speed and direction	RM Young sonic anemometer	10 Hz	Speed of sound		X	X	X	X	X
PMcoarse, PM2.5, ultrafine PM elements and toxicology	Sioutas multi-slit impactor (400 LPM)	48-h (2-in-3 day)	ICP-MS, RT-PCR, ELISA		Xf		X
PMcoarse, PM2.5, ultrafine compositiona	DRUM sampler (10 LPM)	3-h	S-XRF		Xg	X	X	X	X
PMcoarse, PM2.5 mass and elementsb	Dichot (16.7 LPM)	12-hrd	ED-XRF and ICP-MS			X	X	X	X
Black carbon (BC)b	Magee aethalometer AE22	5-min	IR absorption			X	X	X	X
Wind speed and directionb	RM Young wind vane	1-min	Cup and vane				X
Carbon monoxide (CO)b	Thermo	1-min	NDIR photometry		Xh	X	X	X	X
Oxides of nitrogen (NO and NO2)b	Thermo	1-min	Chemiluminescence		Xh	X	X	X	X
Sulfur dioxide (SO2)b	Thermo	1-min	Fluorescence		Xh	X	X	X	X
Ozone (O3)	Thermo	1-min	UV Photometry				X
PMcoarse, PM2.5, ultrafine PM elements and toxicologyb	ChemVol (900 LPM)	48-h (2-in-3 day)	ICP-MS, RT-PCR, ELISA				X
Particle size distribution	SMPS, APS	5-min	CPC and optical counter				X
PMcoarse and PM2.5 massb	API 602+	1-h	β-gauge				X
PM2.5 mass	SHARP	1-min	Nephelometer and β-gauge				X		X

Abbreviations: PM = particulate matter; VOCs = volatile organic compounds; PFT = perfluorocarbon tracer; DRUM = Davis rotating drum unit for monitoring; SMPS = scanning mobility particle sizer; APS = aerosol particle sizer; API = ; SHARP = synchronized hybrid ambient real-time particle monitor; I = indoor; O = outdoor; GM = gravimetric mass; ED-XRF = energy dispersive X-ray fluorescence; S-XRF = synchrotron X-ray fluorescence; ICP-MS = inductively couple plasma-mass spectroscopy; OT = optical transmittance; IR = infrared; UV = ultraviolet; CPC = condensation particle counter; SEM = scanning electron microscopy; GC–MS = gas chromatography–mass spectroscopy; qPCR = quantitative real-time polymerase chain reaction; RT-PCR = reverse transcription polymerase chain reaction; ELISA = enzyme linked immunosorbent assay; NDIR = non-dispersive infrared; and CL = chemiluminescence. X indicates that the data were measured at the specified location.

^aDuring Fall intensive only.

^bSamplers also operated between intensives.

^c6–10 am, 10 am–4 pm and 4 pm–6 am.

^d24-h between intensives.

^eDuring Spring intensive only.

^fMaybury only.

^gIndoor and outdoor at Maybury, outdoor at Ludington.

^hMaybury during Spring intensive only.