The sky was ashy as yesterday (15th) as it made the weather clear for a while. I did not worry about fine dust for more than 110 days since last June, but since yesterday, the ultrafine dust has deteriorated to 'bad' level. Suddenly there was a lot of people who checked the dust level on the air today (16th). Chungcheong and southern regions, where super fine dust warnings were issued everywhere, are expected to maintain a fine dust level all day long.
Did the air raid of micro dust start in earnest? In today's report +, we will see how long the restarting fine dust will continue and what is the cause of it.

■ 'Clear sky where blurred vision' ... Fine dust again, where did it come from?

The fine dust has affected some areas until today, and it seems that it will gradually disappear tomorrow. But, the future is a problem. This is because air pollution is expected to become more frequent. In particular, be careful of ultrafine dust that is smaller than fine dust. Small diameters of less than 2.5 micrometers (㎛) make it very difficult to penetrate the body.

In fact, yesterday, the ultrafine dust concentration in Seoul exceeded 50 micrograms (㎍), and in the evening, most provinces in the country were exacerbated with 'superfine dust concentration'. So why is the sky that has been clear for a while suddenly covered with fine dust?

In fact, this fine dust is influenced by China. There are people who have recently taken out the coat as the weather has become chilly recently. China also started to heat down as the temperature dropped, and its influence is being received by our country. A lot of high-concentration fine dusts have flown to our country from Northwest wind from China, and the domestic atmosphere is stagnated, and fine dust accumulates. ■ "The factory has been cracking down" ... Could the loose pollutants be released, the fine dust gets worse?

It is expected that fine dust will be getting worse due to the influence of domestic and overseas heating equipment operation. The bigger problem is that China's pollutant emission controls have been loosened. At present, the sky in Beijing, China is covered with smog. Beijing's ultrafine dust concentration has exceeded 200 micrograms per cubic meter (㎍), and the number of people wearing masks has also increased noticeably.
Moreover, the situation will become even worse as temperatures drop. The Chinese government has lowered its target for fine dust reduction to 3 percent this winter for northern cities, which were initially set at 5 percent of the previous year. This is only a fifth of the 15 percent reduction we presented last year. China has lowered its reduction target because of the Central American relationship. When the trade war with the US worries about the contraction of the economy, it will increase the industrial production and save the economy.

In an interview with SBS reporters, Chinese citizen Kwak Mo said, "The enforcement of the environmental authorities is getting poorer." Many pollution - causing factories are operating again. " In addition, the next month when the winter will start, the air quality will start to warm up, and Beijing's air quality will deteriorate, which will have a negative impact on our country.

■ "It is already in mid-October but fine dust" It is hard to see clear sky until next spring ...

When the situation of the fine dust is not bright due to the domestic and foreign situation, when can you see the clear sky again? According to monthly statistics of superfine dust concentration in Seoul, the concentration of ultrafine dust is low from July to October when the rain is low and the air flow is smooth. However, the superfine dust concentration sharply increases from November, when heating starts, to early June, before the heat starts.

The National Institute of Environmental Research's statistics of average dust concentration in the metropolitan area between 2014 and 2016 show that fine dust lasts until the following spring. Unfortunately, until next spring, it is more likely that you will see more of the cloudy skies over clean, clear skies without fine dust and ultrafine dust.
(Cover: Airport Jin, Sang Wook Yoon / Planning / Composition: Song Wook, Chang Aram / Design: Chung Ho Chung)