emissions

Drivers in the U.S. have longer commutes than those in Europe and Asia, on average. In the U.K., short commutes in vehicles with combustion engines—whether gasoline or diesel—pose particularly tough emission problems. That's because the exhaust aftertreatment systems have to warm up...

A global push to reduce vehicle emissions and create cleaner air for future generations has been underway for half a century now. However, while many governments around the world have introduced lower emission and higher fuel-efficiency standards for passenger cars, another large contributor to...

To most North Americans, the idea of banning all vehicles with internal-combustion engines seems unthinkable. Filling up with gasoline (or diesel) is as American as are dispersed low-density suburbs without mass transit, bike paths, or even sidewalks. Europeans, more of whom live in cities and most...

As corporate average fuel economy requirements that started in 2012 continue to tighten, automakers have turned to an entire arsenal of tactics to reduce the fuel their vehicles burn. Downsized and turbocharged engines, transmissions with many more gears, lighter-weight structures, better...

The best analog to EPA administrator Scott Pruitt's latest action might be for the U.S. Geological Survey to undertake a "scientific critique" of theories that the world is round. After all, numerous authoritative sources over the years have raised doubts that the Earth is not flat. Surely their...

The Trump Administration has had a challenging start on numerous fronts, but its work to slash emission rules and eliminate regulations continues. The EPA administrator, climate-science denier Scott Pruitt, has said he isn't "currently" planning to target California's ability to set its own...

Diesel-powered vehicles are facing a tough road ahead as more European cities move to ban older, dirtier, oil-burning cars. Diesel has long been the preferred fuel of European drivers thanks to its efficiency and lower carbon dioxide levels. However, mounting research has shown diesel-powered cars...

Sometime between March 1 and 7, a specific page vanished from the website of the U.S. Environmental Protection Agency. Amidst coverage of the removal of the word "science" from the mission statement of the EPA's Science and Technology Office, it went largely unnoticed. First posted in December...

Electric cars have no tailpipe emissions when running. But unless they're charged entirely on renewable energy—still statistically unlikely today—there are emissions associated with generating the electricity used to charge their batteries. For several years now, rigorous...

The question is a reasonable one: electric cars may be zero-emission, but what about the electricity to recharge them? While renewable energy is growing globally, burning fossil fuels is still the source of most electric power today. The good news is that in most areas of the U.S., the "wells to...

In the wake of its diesel emission scandal, Volkswagen has done its best to portray itself as a cleaner, more thoughtful automaker. Part of the damage control plot includes a slew of new electric vehicles to round out the German automaker's portfolio in the coming years. But, what about the...

During President Donald J. Trump's half-hour meeting with Pope Francis at the Vatican yesterday, the pope gave the president a copy of his 2015 encyclical calling for urgent, drastic cuts in fossil-fuel emissions. It is unclear whether the U.S. president will peruse the document. Back at home...

The U.S. Justice Department sued Fiat Chrysler Automobiles yesterday over allegations that diesel engines in its light-duty trucks included equipment to defeat Environmental Protection Agency emissions tests. First reported as impending last week, the suit alleges that FCA fitted up to eight...

Carlos Ghosn, the man behind the Nissan Leaf electric car and now the chairman of the Renault Nissan Alliance, isn't the first to say it. But his recent comment that cities are driving the push for electric cars is an important one, because it indicates a prime market for their advantages. The...

While the news headlines on President Donald Trump mostly address potential scandals, his administration has also lagged significantly in appointing top-level officials to run government agencies. Those that have been appointed often have an adversarial relationship to the missions of the agencies...

Much of the news out of Washington, D.C., these days has to do with the possibility of political scandal. But the wheels of government keep turning, and significant changes are happening at numerous agencies charged with missions as diverse as collecting intelligence, supporting education, and...

When a major lobbying group issues a statement replying to an academic study the same day that study first hits the media, you know it's major. On Monday, the Diesel Technology Forum responded to an article in Nature with a statement that supported "improved real-world testing" of diesel emissions...

Today's political climate has made for fluid motion in regulations, and corporate average fuel economy targets haven't been left out. Suppliers and automakers have already begun investing heavily into vehicles to be sold in 2022 through 2025, which will include various fuel-saving and...

The 436 scientists who spend their days testing new vehicles and enforcing environmental rules at the National Fuel Emissions Lab in Ann Arbor, Michigan, face a very uncertain future. The lab sits in the crosshairs of President Trump's proposed budget, which eliminates 99 percent of its funding, as...

California began regulating vehicle emissions within its boundaries before the Environmental Protection Agency was even a gleam in President Richard Nixon's eye. Since that agency was founded in 1971 with an executive order by Nixon, the state has retained the right to set its own—more...