Themajority of themeasurements at the I-96 site during the NEXUS
seasonal intensiveswere located at the site 100 mnorth of I-96,with selected
monitoring at the other three locations. Sub-daily integrated PM
samples for elemental and organic speciation were collected every
other day during three sampling periods per day to separate the morning
and evening peaks in commuting traffic. Two 12-hour samples of
PM2.5 and PMcoarse were collected using a dichotomous sampler for
mass and composition analysis to compare with integrated and continuous
measurements. Continuous measurements of PM2.5 and PMcoarse
mass were alsomade at the site 100 mnorth of I-96, along with continuous
BC, particle counts and size distribution, NOx and CO. Canister samples
for volatile organic compounds (VOCs) were collected during the
morning rush hour (6–10 am) every other day.
Ludington
School
N-1
S-1
I-96 Site
Maybury
S-2
School
0 2 5 10
High traffic/high diesel (HD) High traffic/low diesel (LD) Low traffic (LT) > 300 m
Kilometers
Fig. 1. Location of roadway segments around which children were recruited to participate in NEXUS and the locations of homes, schools and the I-96 site where traffic-related air
pollutants were measured (see Section 2.3). Data from homes N-1, S-1 and S-2 are discussed in Sections 3.2 and 3.3.