I think it is D mild I am just guessing.
Clam Juice :))
IGNORE THIS BECAUSE I NEED MY ANSWER TO BE LONGER LOL
Answer:
C)They made emission standards stricter
Explanation:
Air Pollution is a huge global issue. UK's government did following to cut down air pollution.
Emission standards is quantitative limits on maximum permissible limits of pollutant gases.
So, to reduce air pollution, government makes emission standard stricter.