Canada Wildfires Cause Poor Air Quality for Toronto, Minneapolis and New York

Wildfires burning in Canada were causing unhealthy air quality across parts of North America on Monday.

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What to Know About Legionnaires’ Disease, Which Has Sickened 22 in N.Y.C.

The cases are most likely linked to a cooling tower in central Harlem, health officials said.

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F.D.A. Approves Juul Vapes After Yearslong Delay

The company was accused of marketing its products to teenagers, causing a surge in use.

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Do I Really Need an Air Purifier?

We asked the experts how to decide.

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Many Older People Embrace Vaccines. Research Is Proving Them Right.

Newer formulations are even more effective at preventing illnesses that commonly afflict seniors — perhaps even dementia.

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Measles Surge in Southwest Is Now the Largest Single Outbreak Since 2000

Growing case numbers suggest that national total will surpass that seen during the last large outbreak in 2019.

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Sandstorm Turns Iraq’s Skies Orange and Sends Thousands to Hospitals

Climate experts say such storms are becoming more frequent and severe in the country. This was its worst of the year so far.

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Ahead of the Masters, Golfers and Fans Load Up on Allergy Medication

The grass and trees at Augusta National Golf Club help make the course a treasure — but also an allergy nightmare.

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Pope Francis Came Near Death in Hospital, His Doctor Says

In an interview, the leader of Pope Francis’s medical team called it “a miracle” that the 88-year-old pontiff left the hospital, but said he needs to change his vigorous habits, at least for a while, to recover.

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RFK Jr.’s Prescription for Bird Flu on Farms: Let It Spread

The health secretary has suggested allowing the virus to spread, so as to identify birds that may be immune. Such an experiment would be disastrous, scientists say.

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