Should states continue to pass the smog tests for the polluting diesel cars?

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5. NYT: How Many Deaths Did Volkswagen’s Deception Cause in the U.S.?

How Many Deaths Did Volkswagen’s Deception Cause in the U.S.?

Volkswagen’s diesel deception unleashed tons of extra pollutants in the United States, pollutants that can harm human health. So while many commentators have been quick to say that the cheating engines are not a highway safety concern, safety — as in health — is still an issue.

The chemicals that spewed illegally from the Volkswagen diesel cars — known as nitrogen oxides or NOx — have been linked to a host of respiratory and cardiovascular illnesses, as well as premature deaths. Nitrogen oxides are a byproduct of burning fossil fuels at high temperature, whether in cars, power plants or other machines like industrial boilers. The chemicals can be harmful to humans, and in warm, sunny conditions, they can also turn into ground-level ozone, or smog, and unhealthy particle pollution.

Nitrogen dioxide and ozone irritate the lungs, increasing airway inflammation, coughing and wheezing, and can lower resistance to respiratory illness like influenza, especially with long-term exposure. The chemicals can also worsen the suffering and risk of serious illness or premature death for those with conditions like asthma and chronic obstructive pulmonary disease. Older people, who are more likely to have these ailments, are particularly vulnerable.

The impact of smog and soot pollution on global health is substantial: A recent paper by Jos Lelieveld, at the Max Planck Institute for Chemistry in Germany, and colleagues estimated that air pollution causes some three million premature deaths a year, and that the number of deaths could more than double by 2050.

The American Lung Association estimates that nearly 41 percent of Americans live in areas with unhealthy levels of ozone. And that’s with reductions brought about by national air quality standards and regulation. Between 1980 and 2014, the E.P.A. estimates that nitrogen dioxide levels in the air fell by more than half. The Obama administration has stepped up its regulation of emissions from power plants and tightened standards for vehicles. A still tougher ozone standard is expected next month.