Environmental Health

Pollutants from Vehicle Exhaust Near Highways 97

ASTHMA AND HIGHWAY EXPOSURES

Evidence that near highway exposures present elevated risk is relatively well devel-

oped with respect to child asthma studies. These studies have evolved over time with

the use of different methodologies. Studies that used larger geographic frames and/or

overall traffic in the vicinity of the home or school [49–52] or that used self-report of

traffic intensity [53] found no association with asthma prevalence. Most recent child

asthma studies have, instead, used increasingly narrow definitions of proximity to

traffic, including air monitoring or modeling) and have focused on major highways

instead of street traffic [54–59]. All of these studies have found statistically ...