Air pollution levels temporarily plummeted, with nitrogen dioxide levels in Wuhan, China, and Milan, Italy decreasing by 30 to 40% between January and March, there's a drastic change in the northern part of the country.
空氣汙染水準暫時大幅下降,1月至3月,中國武漢和意大利米蘭的二氧化氮含量下降了30%至40%,北方地區出現了劇烈變化。