Chemistry
Sulphur dioxide level in the atmosphere can be reduced by using

Static electricity to attract it in factory chimneys
Catalytic converters in industry
Low - sulphur fuels
More efficient car engines

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Chemistry
The lustre of the metals is because of

Reflection of light due to the presence of free electrons
Absorption of light due to the presence of cavities
High polish
High density, due to closed packing of atoms

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