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. 2020 Nov 27;28(2):1356–1364. doi: 10.1016/j.sjbs.2020.11.065

Table 1.

Mean (mean ± SE) concentrations of pollutants before COVID-19 lockdown.

	CO	PM₁₀	SO₂	NO₂	O₃
Makkah	966.53 ± 38.65^cd	195.06 ± 6.03^b	20.80 ± 2.46^a	22.05 ± 2.06^cd	50.85 ± 21.16^cde
Ha'il	678.23 ± 13.39^d	83.90 ± 5.18^c	6.40 ± 0.52^d	18.86 ± 4.41^d	69.27 ± 2.25^abc
Jeddah	1316.95 ± 70.07^b	190.19 ± 12.38^b	19.44 ± 2.12^b	35.59 ± 3.29^b	56.72 ± 5.95^bcd
Jazan	1289.82 ± 57.60^cd	98.54 ± 14.94^c	24.22 ± 3.55^a	19.16 ± 2.20^d	22.53 ± 1.96^f
Tabuk	1182.64 ± 110.25^bc	94.95 ± 3.51^c	12.96 ± 0.52^c	12.39 ± 1.23^e	93.29 ± 3.71^a
Al Madinah	959.40 ± 56.79^cd	116.60 ± 9.76^bc	15.66 ± 2.05^bc	42.19 ± 3.49^a	29.96 ± 2.41^ef
Al Qasim	997.15 ± 128.83^cd	186.99 ± 7.34^b	6.51 ± 0.75^d	6.41 ± 1.15^f	41.53 ± 1.75^def
Riyadh	2162.01 ± 214.31^a	518.42 ± 29.98^a	10.62 ± 1.81^cd	44.30 ± 1.99^a	46.36 ± 6.31^cdef
Haql	757.92 ± 71.89^d	174.57 ± 10.79^b	15.21 ± 3.06^bc	23.95 ± 7.43^cd	79.61 ± 7.87^ab
F value	18.968	2.298	7.700	11.593	7.722
P value	0.000	0.025	0.000	0.000	0.000

Mean±S.E with different superscripts (a-g) along the same column were significantly different (p < 0.05).