Which Malaysian cities show the most significant drop in nitrogen dioxide?

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Kuala Lumpur and Johor Bahru Show Most Significant Drop in Nitrogen Dioxide Levels

Satellite spectrometry data analysis indicates a substantial decrease in nitrogen dioxide levels, particularly over Kuala Lumpur and Johor Bahru, since the implementation of Malaysia's movement control order (MCO) on March 18. This reduction in a key air pollutant is a direct consequence of reduced human mobility and associated vehicle emissions during the MCO period.
Dramatic Fall in Nitrogen Dioxide Observed

Maps derived from satellite spectrometry data reveal a significant decline in nitrogen dioxide concentrations in the skies over Malaysia. The most pronounced decreases have been noted in urban centres such as Kuala Lumpur and Johor Bahru. This phenomenon began concurrently with the nationwide MCO, which commenced on March 18, aimed at curbing the spread of the virus.
Reduced Mobility Drives Emission Cuts

The observed drop in nitrogen dioxide levels is directly linked to the decreased mobility of the Malaysian population during the MCO. With the majority of citizens instructed to remain at home, there has been a consequent reduction in vehicle usage. Nitrogen dioxide is a primary pollutant emitted from the combustion of fossil fuels, with motor vehicle exhaust fumes accounting for approximately 80 percent of its generation.
Unintended Positive Environmental Impact

Think City programme director Matt Benson highlighted that this positive environmental outcome was an unforeseen consequence of the MCO. The organisation's mapping efforts, comparing current nitrogen dioxide levels with those from the same period last year, demonstrate that reduced movement by Malaysians has led to fewer vehicle emissions. This trend is particularly notable along the densely populated west coast of Peninsular Malaysia, an area inhabited by some 20 million people.

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Which Malaysian cities show the most significant drop in nitrogen dioxide?

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