NO2 coming out of car exhausts is a major risk for childhood onset asthma
Four million new cases of childhood asthma per year caused by traffic-related air pollution - health short science news

Globally, there are an estimated 170 new cases of childhood asthma, caused by traffic-related air pollution, per 100,000 children per year, representing 13% of all annual childhood asthma cases worldwide.

Problems are most severe in the big Chinese cities, Seoul, and Moscow.

Pollution, especially NO2, in these cities is below the maximal recommended levels, and researchers therefore propose to re-evaluate those levels to reduce the number of children with asthma.

Read the full story: The Lancet Planetary Health