Question

Which factors have reduced air pollution in Western Europe? Choose all that apply. agricultural intensification catalytic converters cleaner burning fuels improved engines metering water use

Answer 1

improved engines 
cleaner burning fuelscatalytic converters


Which factors have reduced air pollution in Western Europe?
NOT:
metering water use
agricultural intensification 

Answer 2

The correct options are:

- Improved engines; engines were improved significantly so that they can have the same power and agility but by using less fuel.

- Cleaner burning fuels; it has been invested a lot of time and money into improving the fuels and making them as effective as possible but also removing or lowering the most dangerous components towards the environment.

- Catalytic converters; this devices for exhaust emission control manage to convert the toxic gasses and polutants into less toxic pollutants by managing to catalyze a redox reaction.