The Tokyo Air Pollution Trial filed in 1996 won the settlement and settled in 2007, and an asthma medical expenses subsidy program was created in Tokyo. The government, automakers, the Tokyo Metropolitan Expressway Company, and Tokyo will contribute 20 billion yen to subsidize the cost of their own medical expenses for asthma patients in the city. It was decided to receive a grant. As a result of this, it is possible to receive treatment without worrying about medical expenses, but of course, according to the questionnaire results, the great result is that the symptom of the majority is improved.

However, since the government and automobile manufacturers refused to make additional contributions while the initial financial resources were exhausted, the new certification was discontinued in 2015, and from 2018 onwards, only subsidies exceeding 6,000 yen per month were subsidized. Then the relief level has been cut down.

For this reason, there has been a growing movement to seek relief at the national level.