Assessing Spatiotemporal Characteristics of Urban PM2.5 Using Fractal Dimensions and Wavelet Analysis

Table 1

Comparison of estimated PM2.5 concentration with measured PM2.5 concentration (unit: μg·m⁻³).

Date	Measurement	Estimation	Absolute error	Relative error (%)
2014.01.15	34.93	27.13	7.8	22.33
2014.01.26	95.53	73.74	21.79	22.81
2014.02.06	172.68	202.29	29.61	17.15
2014.03.18	144.16	148.45	4.29	2.98
2014.04.07	165.5	183.47	17.97	10.86
2014.04.09	66.06	79.93	13.87	20.0
2014.05.21	15.47	11.65	3.82	24.70
2014.06.04	72.14	79.27	7.13	9.88
2014.06.11	25.8	23.4	2.4	9.30
2014.06.23	15.67	12.89	2.78	17.74
2014.07.02	8.11	11.43	3.32	40.94
2014.07.09	18.44	22.35	3.91	21.20
2014.08.15	13.46	14.37	0.91	6.76
2014.08.26	9.81	5.93	3.88	39.55
2014.08.28	13.61	9.83	3.78	27.77
2014.08.29	18.94	15.95	2.99	15.79
2014.09.12	7.66	10.07	2.41	31.46
2014.09.16	44.98	59.49	14.51	32.26
2014.09.26	38.71	25.82	12.89	33.30
2014.10.08	54.33	46.71	7.62	14.03