In conclusion, motor vehicle air pollution, industrial smoke,
active and passive smoking, and exposure to ETS were
observed to be associated with disease asthma as compared to
non-asthmatics subjects. Factors, hospitalization for asthma
and maternal family history of asthma and older age, were
found to be associated with the severity of disease asthma.
Since asthma is associated with motor vehicle air pollution,
industrial smoke, active and passive smoking, and exposure
to ETS, minimizing exposures to these may help in better
asthma control. However this is an area specific study and
further multi-center studies with long-term follow-ups are
needed in this area to confirm this finding