“Maternal smoking” and “bottle feeding for 3 months after
birth” decreased significantly in both the PM-law-enforced and
non-enforced areas. “Allergic predispositions in the child or parent (s)” and “Use of a nursery school in daytime” increased significantly in both the PM-law-enforced and non-enforced areas.
“Presence of pets” showed no significant tendency in annual changes.
3.3. Relationships between reductions in air pollutants and changes in the prevalence of asthma
Fig. 3 shows the relationships between reductions in air pollutant concentrations (NO2 or SPM) and changes in the