Understanding the human body is a team effort. That's where the Yachtel group comes in.

Researchers at Yachtolt have been delving into the secrets of probiotics for 90 years.

Yacold also partners with nature portfolio to advance gut microbiome science through the global grants for gut health, an investigator-led research program.

To learn more about Yachtolt, visit yawcult.co.

.jp.j. That's Y-A-K-U-L-T.C-O.J-P. When it comes to a guide for your gut, count on Yacult.

This is Scientific American's 60-second science. I'm Christopher in Taguata.

Air pollution causes millions of premature deaths around the world every year, according to an

estimate by the World Health Organization. And one of the most significant drivers of air pollution

in cities is the exhaust that comes out of tailpipes, from cars, trucks, and buses.

In an effort to tame its air pollution, the city of Hong Kong has deployed a system

that can sense when a highly polluting vehicle drives by.

There are more than 150 sites for the monitoring of vehicle emissions in Hong Kong

so that high-emitting vehicles can be identified quickly and enforced

for repair. John Joe is an environmental engineer at the University of Technology, Sydney,

and he's co-author on a new analysis of that program in the journal Science Advances.

He says the system works like this. Sensors at road level shoot beams of light across the road to a

reflector. The sensors then measure how much light is absorbed by pollutants and roughly calculate

emissions from passing vehicles. At the same time, the system's reading license plates,

and it sends notices to big polluters. Enforcement began in 2014.

In the following four years, the program pulled 16,000 vehicles off the road, mostly taxis,

but also private cars and buses.

Government subsidies helped to fix up 96% of those vehicles and ensured they passed smog tests. You know, hopefully from the publication of this research,

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