Question

1 . What is SPM? What harm does SPM pollution cause?2.Carbon dioxide in air is essential as plants use it to make food. When does it become a pollutan? What damage does it cause?

Answer 1

SPM stands for suspended particulate matter.They are basically soot and dust that are suspended in the air.They are released by factories and automobiles.
They cause respiratory problems and decrease visibility during winters.Carbon dioxide is indeed essential for life on earth they become pollutants only when they are present in large quantities.They trap the suns heat and raise the Earths temperature this causes melting of glaciers that leads to floods in polar regions.

Answer 2

Answer:

Minute solid particles suspended in air are known as suspended particulate matter or SPM. Unburnt carbon particles given out during the burning of fuels or from the exhausts of vehicles, and fine particles of cement given out from a cement factory are examples of SPM. The finer of these particles cannot be filtered by the hair in our noses and hence are a major cause of lung diseases. They also settle on plants and interfere with photosynthesis