The correct options are
A Volcanoes
B Pollen grains released by plants
D Mining
Suspended particulate matters are solid or liquid pieces of suspended particles in the atmosphere. This includes both organic and inorganic particles such as smoke, dust, dirt, pollen etc.
The eruption of volcanoes throws big amount of particulates into the atmosphere, including volcanic ash and gases.
Mining of coal and stone releases coal dust and stone dust that cause air pollution.
The pollen grains released by plants remain floating in the air.
Incomplete combustion of fuels, pollute air by releasing poisonous gas, carbon monoxide.