antecedent

[Progress]

Chemicals, smoke and gases are causing a group of unpleasant and dngaerous symptoms called sick building syndrome. Experts have found that buildings create their own pollution, which is actually tow to five times worse than outside pollution.

Is it absoulutely correct to say that the antecendent of , which is their own pollution? other options?

Thank you very much

[White Rabbit]

Another option would be 'Experts have found that the pollution created by buildings is actually two to five times worse than outside pollution.'

[Progress]

Thanks White Rabbit

If you teachers have to chose from #1 to #3, which do you chose?

#1 Experts have found that builidnings create their own pollution
#2 that builidings create their own pollution
#3 their own pollution

I have been thinking about between #1 and #2

That builings create their own pollution is two to five times worse than outside pollution.

Their own pollution is two to five times worse than outside pollution.

This question itself is kind of nonsense. Because we know what , which implies : pollution created by bulidings inside. But this is from a school material. I don't have the answer sheet but school teachers have. I am a private cram school teacher.

[Casiopea]

Here's a trick of the trade. When it doubt, change the which-clause back unto an independent clause:

Experts have found that buildings create their own pollution. Their own pollution is actually two to five times worse than outside pollution.

Experts have found that buildings create their own pollution, which is actually two to five times worse than outside pollution.

The writer is comparing inside pollution and outside pollution.

The which-clause seems hard to parse because the head of the phrase it refers to (i.e., their) also refers back--to building, the head of the main clause.

Does that help?

[Progress]

Yes, it does. Thanks Casiopea
I would like to know the difference of the sense of language between
Experts have found that buildings create their own pollution, which is ....
Experts have found that buildings create their own pollution. It is ...

I know the difference gramatically but I don't know the difference of the sence. Would you teach it to me?

[Casiopea]

Progress, I don't fully undestand what you are asking.