最近の窒素酸化物対策の状況

抄録

This report describes the current state of air quality and its trends, countermeasures.
Nowadays, in environment, sulfer dioxide is keeping good condition, but nitrogen dioxide, suspended particulate matter and oxidants are far from desirable level.
There are many reason to this environmental air pollution, but the biggest problem to solve is automobiles.
Owing to the rapid growth of the traffic of certain types that emit larger amounts of nitrogen oxides, the amount of automobile exhaust has not been decreased significantly.
So we have to make up new regulation, especially for automobiles to achieve the Environmental Quality Standard.