What is the purpose of the catalytic converter (katalizator) and particulate filter in a modern passenger car exhaust system?

1. Convert harmful exhaust pollutants (carbon monoxide, hydrocarbons, nitrogen oxides, and soot) into less harmful gases (CO2, water vapor, and nitrogen)
2. Increase exhaust engine noise to alert pedestrians
3. Recycle engine oil back into the fuel tank
4. Cool the passenger compartment air conditioning