Table 3.

Change in PM_2.5, PM₁₀, SO₂, NO₂ and CO concentration between 2020 and historical years (2015–2019).

Pollutants	Order Categories	2019	2018	2017	2016	2015
PM2.5 (μg/m3)	SO40	−0.52, −0.41*	−1.28, −1.15*	−0.62, −0.49*	−1.08, −0.95*	−1.55, −1.41*
	SO40M	−0.45, −0.26*	−0.74, −0.54*	0.19, 0.38*	0.27, 0.50*	−0.56, −0.31*
	AO	−0.03, 0.23	−0.65, −0.37*	1.21, 1.52*	0.87, 1.21*	−0.13, 0.23
	NSO	−0.22, 0.09	−0.66, −0.34*	−0.3, −0.02*	0.24, 0.62*	−0.32, 0.03
PM10 (μg/m3)	SO40	−2.93, −1.62*	−8.13, −7.13*	−6.43, −4.97*	−6.65, −5.16*	−4.83, −3.43*
	SO40M	−0.9, −0.24*	−2.3, −1.63*	−0.82, −0.11*	−0.34, 0.32	−1.67, −0.96*
	AO	0.02, 5.4*	−7.65, −2.56*	−12.15, 1.97	−5.47, −0.39*	4.53, 8.0*
	NSO	0.99, 2.19*	−2.68, −1.32*	−1.8, −0.52*	−1.61, −0.27*	−3.71, −2.25*
SO2 (ppb)	SO40	−0.08. -0.03*	−0.79, −0.60*	−0.6, −0.48*	−0.57, −0.46*	−0.71, −0.62*
	SO40M	−0.69, −0.24*	0.29, 0.52*	0.15, 0.39*	0.16, 0.39*	−0.11, 0.13
	AO	−0.18, −0.01*	−0.36, −0.16*	−0.33, −0.12*	0.07, 0.19*	0.08, 0.21*
	NSO	−0.07, 0.02	−0.09, 0.00	−0.17, −0.06*	−0.22, −0.11*	−0.45, −0.31*
NO2 (ppb)	SO40	−1.76, −1.54*	−1.98, −1.75*	−1.83, −1.59*	−2.03, −1.79*	−2.14, −1.91*
	SO40M	−1.66, −1.23*	−2.41, −1.96*	−1.55, −1.12*	−1.69, −1.25*	−1.39, −0.96*
	AO	−1.02, −0.76*	−1.2, −0.93*	−0.73, −0.46*	−1.16, −0.88*	−1.39 -1.1*
	NSO	−0.32, −0.13*	−0.83 -0.63*	−0.8, −0.6*	−0.67, −0.47*	−1.07, −0.85*
CO (ppm)	SO40	−0.03, −0.02*	−0.04, −0.03*	−0.03, −0.02*	−0.03, −0.02*	−0.04 -0.03*
	SO40M	−0.04, −0.02*	−0.04, −0.03*	−0.05, −0.04*	−0.06, −0.05*	−0.07, −0.05*
	AO	−0.05, −0.03*	−0.1, −0.07*	−0.09, −0.08*	−0.09, −0.07*	−0.04, −0.03*
	NSO	−0.02, 0.0	−0.01, 0.0	−0.04, −0.02*	−0.02, 0.00	−0.004, 0.02