Question

harmful substances which pollute land,air and water

Answer 1

pollutants like non-bio degradable waste or unwanted substance
carbon monoxide and carbon dioxide are also harmful

Answer 2

hey there

harmful substances which pollute land,air and water are called pollutants

they include -

1) sewage

2) fertilizer

3) exhasts of vehicles like so2, co2 no2 etcs.

4) industrial effluent

5) non biodegradable substances such as plastic , thermocol.

6) chemicals from industries