Levels during boarding and taxiing were far above those defined as high by the World Health Organization

A study has revealed the concentrations of ultrafine particles breathed in by airline passengers.

A team of French researchers, including those from Université Paris Cité, built a pack of instruments that was flown alongside passengers from Paris Charles de Gaulle to European destinations. The machinery was placed on an empty seat in the front rows or in the galley.

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© Photograph: Frank Armstrong/Getty Images

© Photograph: Frank Armstrong/Getty Images

© Photograph: Frank Armstrong/Getty Images

The president’s energy strategy is projected to generate more pollution, but so far production has not risen significantly and price drops have been modest, analysts say.

© Eli Hartman/Reuters

Ridership jumped, people cut back on driving and, over the summer, the city extended the program another year.

© Annick Sjobakken for The New York Times

Nations were poised to approve the first fee on pollution from ships. That’s when the Trump administration began the threats.

© Nathalia Angarita for The New York Times

Studies increasingly find links between higher concentrations of certain pollutants and the prevalence of dementia.

© Lehel Kovács