What would be the most likely effect of the Maryland General Assembly passing a law to reduce vehicle emissions?

The most likely effect of the Maryland General Assembly passing a law to reduce vehicle emissions would be that there would be an increase in the usage of public transport and a considerable decrease in the sale of gasoline.

Explanation:

By passing a law to reduce vehicle emissions, the Maryland General Assembly would most probably ban the vehicles with older engines from being used. This would make the residents of Maryland start using public transport facilities to a greater extent. As the number of vehicles on the road would decrease, the sale of gasoline and other fuels would automatically go down.