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Based on the spread of the new coronavirus infection (corona19), the seasonal management system, and weather conditions, the concentration of fine dust in Korea decreased by approximately 30% from February to March. The government officially recognized that the Corona19 contraction in economic activity had a positive effect on the atmosphere.
The Ministry of the Environment announced on the 12th that the amount of ultrafine dust emissions decreased by approximately 22,000 tons from December 1 of last year to March 31 of this year, during the “dust season management system fine”. Compared to the same period in 2016, emissions were reduced by approximately 19.5%. The concentration of ultrafine powder was 24 µg / ㎥, which was approximately 27% (8.9 µg / ㎥) less than the same period last year (33 µg / ㎥).
“As a result of Crown 19, China’s economic activities, such as traffic volume, have been reduced and economic traffic has decreased by approximately 10% in February and March, and the number of airline passengers has decreased in about 90%, “said Geum Han-seung, Minister of Environment and Environmental Policy of the Ministry of Environment. “Dust emissions are estimated to have decreased.”
The seasonal management system is a system to strengthen the reduction of fine dust emissions than usual when high concentrations are expected. The Ministry of the Environment cited the effects of the policy, as a two-part vehicle, as the cause of ultrafine dust, the climatic effects, such as increased precipitation, and corona effects19, as the decrease in traffic. The concentration of ultrafine dust in Korea was estimated to have decreased by a maximum of 2.8 µg / ㎥ due to the influence of Corona 19 in China. A third of the total decrease (8.9 µg / ㎥) was affected by China.
Ultrafine dust concentrations across the country in February and March, when the Corona 19 crisis was severe, fell 19.3% and 41.1%, respectively, from the average during the same period (2017-2019) in the last three years . On a two-month average, it was 30.2% less. The number of ‘bad’ days of fine dust averaged 13 days over three years, but this was only one day in March. There was not a single day that the “high concentration” was recorded in March. This is in contrast to maintaining an average of 5 days for 3 years.
Even within China, the changes in ultrafine dust concentration before and after the spread of Corona19 were markedly different. The concentration of ultrafine dust across China was 64 µg / ㎥ from January 1 to 4, before Corona 19 began to spread. However, in March, when Corona 19 reached its peak, it halved to 32 µg / ㎥. Concentrations in the Beijing, Tianjin and Hebei regions, near Korea, fell from 119 µg / ㎥ in January to 45 µg / ㎥ in two months. In the same period, concentrations in the Yangtze River Delta and Funway Plain also decreased by 29 ㎍ / ㎥ and 76㎍ / ㎥ respectively.
The Ministry of the Environment has implemented 28 seasonal management policies, such as restrictions on the emission of 5th grade vehicles in the metropolitan area. It was analyzed that there was an effect of reducing the concentration of ultra fine dust. Reduced ultrafine dust concentration due to weather effects, such as increased wind and precipitation, was estimated to be approximately 0.2㎍ / ㎥ in the first half and 5.8㎍ / ㎥ in the second half. In the second half, the effect of the policy itself increased, but as external factors expanded, the contribution rate of the seasonal management system fell from 34% to 18% to reduce fine dust.
Sejong = Choi Jae-pil reporter [email protected]
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