ACGS	automated canister grab sample
BAC	benchmark ambient concentration
BTM	back trajectory model
cts	counts
EPA	United States Environmental Protection Agency
FS	fenceline sensor
FTC	Firearms Training Center
GC	gas chromatograph
HAP	hazardous air pollutant
Hz	hertz (rate of once per second)
KY	Kentucky
km	kilometer
LMAPCD	City of Louisville Metro Air Pollution Control District
MCGS	manually activated canister grab sample
m	meters
m/s	meters per second
MDL	method detection limit
N	sample number
NATTS	National Air Toxics Trends Station
NGEM	next generation emissions measurement
ORD	Office of Research and Development
PID	photoionization detector
PN	part number
ppbv	part(s) per billion by volume
PS	passive sampler
QA	quality assurance
QUIC	Quick Urban & Industrial Complex
SD	secure digital
SDI	source direction indicator
s	standard deviation
SIS	stochastic industrial source
STAR	Strategic Toxic Air Reduction
SM	Supplementary Materials
TCTA	temporally combined trajectory analysis
TOF	time-of-flight
TO	toxic organics
μg/m3	micrograms per cubic meter
USD	United States dollar
VOC	volatile organic compound
WLATS	West Louisville Air Toxics Study