The main cause of air pollution in this region ARE or IS industrial enterprises. (which form of the verb BE is correct in the sentence, why?)
You need to change the sentence so it is logical. The main contributors to air pollution in this region are industrial enterprises. The main cause of air pollution in this region is industrial enterprises emitting harmful pollutants such as sulphur dioxide and smoke.
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You need to change the sentence so it is logical.
The main contributors to air pollution in this region are industrial enterprises.
The main cause of air pollution in this region is industrial enterprises emitting harmful pollutants such as sulphur dioxide and smoke.