The worst sandstorm to hit northern China in more than a decade struck 12 provinces and the capital, Beijing, on March 14, lasting multiple days.

The sandstorm, which originated in Mongolia, caused hundreds of flight cancellations, and authorities ordered children, the elderly and the ill to remain inside until it was over. Combined with industrial pollution, it raised the air pollution levels to 160 times recommended limits in some areas.

In Mongolia, the sandstorms killed at...

The US Department of State posts up-to-date travel advisories on every country and many territories, ranking each 1 (Exercise normal precautions), 2 (Exercise increased caution), 3 (Reconsider travel) or 4 (Do not travel). Note: A country’s regions are also ranked and may have different rankings than the country as a whole. Visit travel.state.gov and click on “Travel Advisories” at the top of the page.

The West African country of Guinea declared an outbreak of ebola on Feb. 15 after seven people were confirmed to have contracted the virus, three of whom died from the disease. All of the patients had attended the same funeral before becoming infected.

These were the first new cases of ebola in the country since 2016, when, during the worst outbreak of ebola on record, more than 11,000 people died, mostly in Guinea, Sierra Leone and Liberia. The currently infected patients were...