This has resulted in an increase in the emissions of other carcinogens, such as benzene and toluene, whose emission levels catalytic converters do not reduce.
कैटॆलिटिक कनवर्टरस्‌ की सफलता संतोषजनक है, परन्तु उनका प्रयोग विवादास्पद बना रहता है ।