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?

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.

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