In this experiment, PM2.5 and carbon monoxide levels in a room are tested before and after the lighting of a cigarette.

How serious is the pollution caused from smoking two cigarettes in a row?

Cigarette smoke and car exhaust go head to head in carbon monoxide and air pollution level comparisons.

A car is pulled into a closed garage. What will be the effects of air pollution?

What are the PM2.5 and carbon monoxide levels for a cigarette smoked inside a car?

Have you ever thought about growing and raising your own food? That is what C is doing. Let's hear his story.

At first, farmers in the new area didn't trust C's farming method. In order to convince them, C took the farmers on a tour of one of his farms.

While many consider the world Mother Earth, C has a different thought about this: As the land is our child, we must take good care of it.

A perfumer tells us how his lifestyle has changed as he's grown up. He's created the ideal house for him and his numerous pets.

A pefumer describes the features of his exquisite home.

In this video, we demonstrate how to properly wear, remove and dispose of a medical mask.

A Beijing Television segment on the types of masks to use during the COVID-19 epidemic.

In this Beijing Television segment on the types of masks to use during the COVID-19 epidemic, a guest explains the effectiveness of a disposable medical mask.

In this Beijing Television segment on the types of masks to use during the COVID-19 epidemic, a guest explains which masks should be used under which situations.

In this Beijing Television segment on the types of masks to use during the COVID-19 epidemic, a guest explains which masks are ineffective against COVID-19.

In this Beijing Television segment on the types of masks to use during the COVID-19 epidemic, a guest discusses what is dubbed "the selfish mask."

This Beijing Television segment introduces four categories of masks and situations where they're most useful.

Guests on this Beijing Television segment demonstrate how to put on masks properly.

Guests on this Beijing Television segment demonstrate how to remove and dispose of masks properly.

A guest on this Beijing Television segment explains under which situations you can or cannot reuse masks.

Faced with such serious smog and haze, a reporter from Henan speaks with residents about PM 2.5 masks that are useful for blocking dust and smog. A doctor is also interviewed about the effectiveness of such masks and how residents can prevent diseases caused by smog in their daily lives.

How are hailstones formed? Watch and find out!

Learn more about the clouds that produce hailstones and how they are formed in this informative yet simple video.