How do activists know how many trucks rumble through neighborhoods surrounding Port Newark, belching diesel fumes that aggravate the breathing problems of residents? They count them, one at a time, as the rigs roll by. ... Volunteers at the three Ironbound locations counted a total of 1,100 trucks during a 45-minute period, said Isella Ramirez, environmental justice coordinator for the Ironbound Community Corporation, neighborhood non-profit group.