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Diesel exhaust fluid (DEF; also known as AUS 32 and sometimes marketed as AdBlue [3]) is a liquid used to reduce the amount of air pollution created by a diesel engine. Specifically, DEF is an aqueous urea solution made with 32.5% urea and 67.5% deionized water .
Diesel exhaust is the exhaust gas produced by a diesel engine, plus any contained particulates. Its composition may vary with the fuel type, rate of consumption or speed of engine operation (e.g., idling or at speed or under load), and whether the engine is in an on-road vehicle, farm vehicle, locomotive, marine vessel, or stationary generator ...
Only state which still conduct emission testing dating back to the 1967 model year unlike other states using EPA classification (a few still conduct test for 1968–present (1968+ testing is for jurisdictions using defined EPA standards for vehicle classification since the '68 model year and beyond automobiles must have an exhaust emission ...
More than 90% of diesel exhaust consists of ultrafine particles less than 1 micron in diameter. ... Lives can be saved if the EPA takes sufficient regulatory action to meet the urgent public ...
On January 5, 2017, the EPA announced that it was awarding more than $7.7 million to replace or retrofit 401 older diesel school buses from 88 school bus fleets in 27 states. Since 2008, the program has funded over 700 clean diesel projects across the country, reducing emissions in more than 70,000 engines. [10]
On 20 November 2015, the EPA said Volkswagen officials told the agency that all 3.0-litre TDI diesel engines sold in the US from 2009 through 2015 were also fitted with emissions-cheating software, in the form of "alternate exhaust control devices".