Table 2.
National weather announcement and PM_2.5 data in Busan, Jingu

Classification		Temp.(℃)	Wind speed(m/s)	Humidity(%)
Good level (0~15μ/m3)	2020-12-15	−3.7	2.7	30.3
	2021-02-23	7.4	2.5	19.0
	2021-02-28	8.4	2.2	68.3
Moderate level (16~35μg/m3)	2021-01-16	5.2	2.6	36.0
	2021-02-19	−0.2	4.6	42.3
	2021-02-22	14.9	2.4	71.5
Unhealthy level (36~75μg/m3)	2020-12-29	6.5	1.3	78.3
	2021-01-14	6.0	1.9	62.5
	2021-02-21	13.8	3.3	56.3