Question

which gas spread rapdiy ? why
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Answer 1

Answer:

Brownian motion Gas particles move very quickly (air particles move at 500 m/s on average at room temperature). However, a smell does not travel this fast. This is because its particles collide with each other and with particles of air very frequently.

Answer 2

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Emissions of the planet-heating gas CO2 have also fallen sharply.

But there are warnings levels could rise rapidly after the pandemic.

A really simple guide to climate change

Climate-related words and phrases explained

With global economic activity ramping down as a result of the coronavirus pandemic, it is hardly surprising that emissions of a variety of gases related to energy and transport would be reduced.