the Central Pollution Control Board (cpcb) recently declared Chhattisgarh's capital Raipur as the country's most polluted city. Union minister of environment and forests A Raja presented a report in parliament based on a study on the presence of Suspended Particulate Matter (spm) in the air in 52 cities; Raipur ranked highest. spm in Raipur's air is 250 micrograms per cubic meter (