A factory processing acrylic material at the Jalan Kampung Orang Asli industrial area in Kuang, Rawang is allegedly behind the odour pollution which caused Air Selangor Sdn Berhad to shut down four water treatment plants in the state.

In a statement, Environment Department (DOE) director-general Wan Abdul Latiff Wan Jaffar said two individuals were also arrested under Section 25(1) of the Environmental Quality Act 1974 to assist in the investigation.

“We instructed the owner...