“This is far more alarming and widespread than the Volkswagen scandal." An E.P.A. report found that owners of diesel pickup trucks have been using commercially available "tuners" to defeat their vehicles' emission control systems and boost air pollution.  https://nyti.ms/2V1EGNx 
Some of the people who buy equipment to defeat their trucks' emissions control systems want to increase engine performance. Others just want to be obnoxious.
https://www.nytimes.com/2016/09/05/business/energy-environment/rolling-coal-in-diesel-trucks-to-rebel-and-provoke.html
At @NYTClimate, we've been writing for a while now about automotive emissions as a major issue for air pollution and public health https://www.nytimes.com/interactive/2019/10/10/climate/driving-emissions-map.html
You can follow @nytclimate.
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