Substantial improvements in the control of {HEAD ~ pollutants} from internal combustion engines may be obtained by pre drying a catalyst/hydrocarbon trap system and preferably incorporating {TAIL ~ a water trap} in a catalyst/hydrocarbon trap system 
Substantial improvements in the control of { HEAD ~ pollutants } from internal combustion engines may be obtained by pre drying a catalyst / hydrocarbon trap system and preferably incorporating { TAIL ~ a water trap } in a catalyst / hydrocarbon trap system
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH