<prompt> Which of the following is an indor air-pollutonts-Carbon dioxideHCNMethanPerfluoro carbons  <response>: Ans. is a i.e., Carbon dioxide Important indoor air pollutantsPOLLUTANTSSOURCESRespirable particlesTobacco smoke, Stove, Aerosol sprays.Carbon monoxideCombustion equipment, Stove, Gas heaters.Nitrogen dioxideGas cookersCigarettesSulphur dioxideCoal combustionCarbon dioxideCombustion, respirationFormaldehydeParticle board, Carpet adhesives, Insulation.Other organic vapoursbenzene, toluene, etcSolvents, adhesives, resin products, aerosol sprays.OzoneElectric arcing, UV light sourceRadon and daughtersBuilding materialAsbestosInsulation, Fire proofingMineral fibersAppliances 