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The Standard Heights neighborhood sits next to the nation's second-largest gasoline refinery. Recently, residents learned a new truth about the plumes of exhaust they see every day: Exxon Mobil's aging refinery and petrochemical facilities — like many others — are pumping out far more pollution than the law allows.

There is some political willingness, but because China is highly decentralized politically, the Communist Party has only limited influence over provincial governments and how they regulate their dirty factories. The powerful state-owned oil companies have also resisted pressure to produce cleaner-burning fuel.

Atmospheric scientist Ira Leifer installed special air sensors on a camper, then drove from Florida to California, measuring methane levels all along the way. More than 6,000 readings later, he found some noticeable spikes, especially around petrochemical plants and urban areas like Los Angeles.

Getting groceries delivered may be the easiest environmentally friendly thing you've ever done, new research says. Think of it as your food taking mass transit.

About 1.2 million people die prematurely every year in China from exposure to outdoor air pollution. Smog has dogged the country as it grows at an explosive rate and burns huge quantities of fossil fuels. But there are signs that the government is beginning to take the issue more seriously.

According to researchers at Colorado State University, the Clean Air Act worked.Air quality and visibility have improved dramatically according to CSU…

Days after angering cyclists with his contention that people who ride bikes don't help pay for roads — and stating that "the act of riding a bike results in greater emissions of carbon dioxide from the rider," Washington State Rep. Ed Orcutt has apologized for his words.

When Washington State lawmakers proposed a new tax on bikes, the owner of several bike shops protested. He ended up in an email argument with a Republican lawmaker. State Senator Ed Orcutt argued cyclists pollute just by breathing. It is true that a heavy breathing cyclist would emit more carbon dioxide than a person who's just sitting, but Orcutt reconsider his claim and apologized.

Chen Guangbiao is trying to call attention to China's environmental issues by selling clean air. Eighty cents buys you a touch of air from "pristine Tibet."

Air pollution in Fort Collins during the 2012 High Park Fire rivaled some of the worst days in places like Mexico City or Los Angeles—well known for poor…