Fill the following with appropriate words....below related to E.V.S.......

Dear student
1. Decrease in smoke emission. More the number of vehicles more will be the smoke emission.
2. Air impurities also known as air pollutants, refer to substances that are not part of the fresh air content.
3. Earlier trains were run with help of steam engines.
4. Ozone gas protect us from harmful ultra violet rays of sun.

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