2024-05-172024-05-171974https://repoemc.ukm.my/handle/123456789/1082Tambahan Perundangan Persekutuan, Akta Kualiti Alam Sekeliling 1974 (Akta 127)mayPeraturan Kualiti Alam Sekeliling Udara Bersih 1978 – P.U.A 280-78Act