CGTN Sci-Tech

What to know about Canadian wildfires making New York world's most polluted city

Massive fires are burning up stretches of Canadian forests and sending plumes of smoke into the U.S. On Wednesday afternoon, New York City had the world's highest air quality index at 342. Learn from studies and experts about what wildfire smoke contains, what the known health effects are and how we can mitigate the risks. Also in today's newsletter, find out about the "brightest-of-all-time" gamma-ray burst detected by China's high-altitude observatory and the Shenzhen-Zhongshan Link subsea tunnel, which is expected to be completed in the coming days.

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