Investigation of the Implications of “Haze Special Law” on Air Quality in South Korea

Table 2

Descriptive statistics.

Observation	Observation number	Minimum	Maximum	Mean	Standard deviation
Spring	90	18	195	94.289	43.470
Summer	90	13	139	71.722	33.368
Autumn	90	14	170	67.711	36.996
Winter	90	35	204	102.022	33.840
Spring	90	0.013	0.059	0.033	0.011
Summer	90	0.008	0.039	0.024	0.007
Autumn	90	0.009	0.066	0.031	0.012
Winter	90	0.010	0.073	0.038	0.015
Seoul (before law)	305	13	195	79.708	39.268
Seoul (after law)	305	12	210	78.498	37.907
Busan (before law)	305	42	161	91.161	28.590
Busan (after law)	305	23	169	84.023	26.869
Daegu (before law)	305	25	158	86.138	31.332
Daegu (after law)	305	21	168	82.902	28.525