<prompt> In Indoor air pollution, carbon monoxide is produced byCombustion equipmentStoveGas heatersAll of the above  <response>: All of the above 593 - Park 19th 642-Park 20thSources of Indoor air pollutantsPollutantSources Respirable particle Carbon monoxide Nitrogen - dioxide Sulphur dioxide Formaldehyde Ozone Radon and daughters Asbestos Mineral fibresTobacco smoke, stove, Aerosol spraysCombustion equipment, stove, Gas heatersGas cookers, cigarettesCoal combustionParticle board, carpet adhesives insulationElectric arcing, UV light sourcesBuilding materialInsulation, fire proofingAppliances 