Local people had to endure the sight of black water flowing out from huge drainage pipes and inhale smoke from the rice husk companies used as fuel, Binh added.
Source: "Kien Giang tackles pollution at major fishing port", Viet Nam News.
I think there is a mistake here. Shouldn't it be "inhale smoke from the companies (in which/where) rice husk is used as fuel"? Thanks.
Top answer
It means: ... inhale smoke from the rice husk that companies used as fuel .... I don't like to omit "that" in cases like this.
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... inhale smoke from the rice husk that companies used as fuel ....
I don't like to omit "that" in cases like this. While it is not actually incorrect to do so, it just makes the phrase awkward and harder to read, in my opinion.