Air or water

Exercise and reference answers

Upper category

Air

Lower category

Water

Items

1. Category

   Air

   Item

   Scrubber

2. Category

   Air

   Item

   PM 2.5

3. Category

   Air

   Item

   CNG buses

4. Category

   Air

   Item

   Noise

5. Category

   Water

   Item

   BOD

6. Category

   Water

   Item

   Algae

7. Category

   Water

   Item

   Hyacinth

8. Category

   Water

   Item

   DDT

Instructions

Send each pollution clue to the air track or the water track.

Explanation