Offer tax incentives to businesses to develop and implement a "work from home" employee base, when possible. Why have people waste fuel and add to air pollution in order to sit in an office for 8 hours or more every day?
The software technology is available to allow monitoring of employee work time on their computer, and for project management tasks.
Remove 1 million and more drivers/cars from the twice/daily - 5 days a week commute and watch the pollution levels, traffic accidents, and stress levels (which leads to health issues) go down.
It would be a win-win-win proposition for the businesses, the employees, and the environment.