Cat allegedly shipped more than 590,000 highway and non-road diesel engines without correct emissions controls, according to the EPA.
The state's Air Quality Improvement Program invests in new emissions-reduction technologies.
Navistar alleges nitrogen oxide emissions skyrocket when drivers don't keep diesel exhaust fluid topped off.
Aug. 1 deadline is set if fleets want to take advantage of a new regulation designed to reduce greenhouse gas emissions.
Agency calls on SCR engine makers to develop warning systems that alert drivers when diesel exhaust fluid tank is nearly empty.
A cross-border plan is detailed, a Navy vet is named Back on the Road winner, owner-operator is named Goodyear Highway Hero, Trucker Buddy recognizes pen pals and more industry news items are featured.
By installing a particulate filter early on one truck, a fleet will be able to delay compliance for a second truck in the fleet until Jan. 1, 2017.
Only one state is known for strong protection against a chronically malfunctioning truck.
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