Table 5.

Trend analysis of status air quality index and raw concentration of air pollutant values in time interval on months from August 2016 to November 2019 of Addis Ababa central monitoring station (Figures 6 and 7).

S.No	Air quality Index (AQI)				Month	Raw concentration in (µg/m3)
	2016	2017	2018	2019		2016	2017	2018	2019
1	N/A	59.32	88.45	59.13	January	N/A	17.49	29.98	17.33
2	N/A	62.75	65.45	55.88	February	N/A	18.63	19.23	15.22
3	N/A	61.37	79.15	61.73	March	N/A	17.64	25.31	17.79
4	N/A	66.98	69.74	64.56	April	N/A	19.81	23.07	19.92
5	N/A	76.94	84.81	61.87	May	N/A	24.94	28.19	18.16
6	N/A	105.72	116.07	96.65	June	N/A	37.36	42.79	33.45
7	N/A	107.54	98.65	N/A	July	N/A	39.22	34.45	N/A
8	100.46	83.19	87.58	83.21	August	35.67	27.39	29.65	27.74
9	94.12	96.71	71.51	87.04	September	32.93	35.83	16.58	30.02
10	67.63	73.46	55.28	51.87	October	20.20	21.59	14.30	14.47
11	68.68	69.89	53.83	58.64	November	20.71	21.33	15.31	16.89
12	65.71	72.84	62.37	N/A	December	19.62	21.97	18.10

N/A means not available data from recorded from Addis Ababa central monitoring station study site.