CLEAN : Cold nights, warm days trigger pollution a

The transcript discusses the speaker's observations and experiences in different cities, comparing them to other places like China. It highlights the lack of pollution encountered during their travels, despite some fog.

What does the speaker initially compare?

• Different countries

• Different cities

• Different continents

• Different climates

What is suggested about visiting China?

• It would be similar to other cities

• It would be less interesting

• It would make no difference

• It might show a noticeable difference

What did the speaker not notice despite encountering fog?

• Any traffic

• Any noise

• Any pollution

• Any rain

What was the speaker's experience with smell during the observation?

• There was a sweet smell

• There was a strong smell

• There was no smell

• There was a mild smell

What did the speaker encounter during their observation?

• Sunshine

• Snow

• Fog

• Rain