The PM 2.5 concentrations dominated the Air Pollutant Index (API) in Malaysia. • There were several reductions on PM 2.5 concentrations during Malaysia Movement Control Order (MCO). • Several red zone areas showed approximately 28.3% reduction of PM 2.5 concentrations. • The Northern Region of Peninsular Malaysia showed the highest average reduction of PM 2.5 concentrations, with 23.7%.
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