PARIS — ABC News reports that Paris’ Mayor Anne Hidalgo is proposing to make all public transportation in the city free to reduce air pollution, however, the opposition is wondering who would pay for it instead.

During an interview with a French paper, Hidalgo said she has asked three of her assistants to conduct a large study on the subject, which would involve both French and foreign experts.

Hidalgo did not provide specifics about how much the plan would cost or how it would be paid for, but members of the opposition party pointed out ticket sales on the public transit system generate $3.7 billion a year. For the full story, click here.