How much did NO2 drop in Kuala Lumpur and Putrajaya?

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Nitrogen Dioxide Levels Declined Significantly During Initial Movement Control Order Phase

Nitrogen dioxide (NO2) levels in Kuala Lumpur and Putrajaya saw a substantial decrease, ranging between 55 to 68 per cent, during the first phase of the movement control order (MCO). This reduction in air pollutant concentrations is attributed to the diminished activities typically contributing to emissions, such as vehicle exhaust and industrial operations.
Marked Reduction in NO2 in Key Locations

The Department of Environment (DOE) conducted monitoring at air quality stations in Batu Muda and Cheras, both located in Kuala Lumpur, as well as in Putrajaya. In these specific areas, NO2 levels experienced a drop of between 55 and 68 per cent. This significant decline underscores the direct impact of reduced human activity on air quality.
Broader Analysis Shows Widespread NO2 Decrease

Beyond the initial focus areas, the DOE also extended its analysis to air quality monitoring stations in several other major cities across Malaysia. These included Shah Alam, Ipoh, Penang, Kuantan, Seremban, Melaka, Johor Bahru, Kuching, and Kota Kinabalu. For NO2 specifically, the findings across these wider urban centres indicated a reduction ranging from 11 to 62 per cent.
Other Pollutants Also Showed Declines

While the question specifically asks about NO2, the comprehensive analysis by the DOE also revealed significant falls in other key air quality parameters during the same MCO period. Sulphur dioxide (SO2) levels dropped between 17 to 34 per cent in Kuala Lumpur and Putrajaya, and between five to 22 per cent in the other major cities. Carbon monoxide (CO) decreased by six to 15 per cent locally and two to 25 per cent more broadly, while fine particles (PM2.5) saw reductions of six to 14 per cent and two to 23 per cent respectively.

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How much did NO2 drop in Kuala Lumpur and Putrajaya?

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