The concentration of fine dust particles smaller than 10 micrometers in diameter, or PM10, increased to more than three times normal levels Wednesday, with Gyeonggi Province recording the highest figure of 268 micrograms per cubic meter. [...]Here are a couple of photos I took yesterday morning:
The concentration raises the fine dust alert level to “very bad,” the highest level considered by the research center. A scale of zero to 30 is “good,” 31 to 80 “normal,” 81 to 120 “slightly bad,” 121 to 200 “bad” and 201 to 301 “very bad.”
Not exactly the time of year for hiking, I guess, but at least, as a friend noted, it does trap the heat and make the weather warmer.