For the future, it could be important to study other nurseries to
help supporting these findings, not only in urban traffic influence
context, but also in other contexts, like urban background and rural.
In next studies it could be important to determine the particulate
matter composition (heavy metals, PAH’s). Measurements of the air
flow rates could also be important to refine the analysis on the
occupancy and air renovation rates. It could also be important to
study the association of PM air pollution in these nurseries with
children’s daily exposure. Further investigations at home and in
other microenvironments occupied by children are needed to understand
if there is, or not, an increased risk of adverse health effects
on children attending nurseries when compared with those
cared at home.