. 2020 Jun 28;742:140516. doi: 10.1016/j.scitotenv.2020.140516

Table 2.

Change in mean air quality during the SOE. If mean air quality is the lowest during 2020 since any year between 2015 and 2019, the reduction to the previous minimum annual value is presented in brackets.

Station name	PM_2.5 (μg/m³)		NO₂ (ppb)		NO_X (ppb)		O₃ (ppb)
	SOE	Reduction	SOE	Reduction	SOE	Reduction	SOE	Reduction
Cornwall	−0.2		0.4		0.4		2.2	(0.8)^a
Ottawa Downtown	−0.4		1.2	(0.6)^a	1.6	(1.2)^a	1
Kingston	0.5	(0.2)^a	0.7		0.7	(0.1)	0.8
Belleville	−0.3		0.9	(0.3)^a	1	(0.1)^a	1
Petawawa ^R	−0.2		NA		NA		0.8
Peterborough	0.1		0.7	(0.5)^a	0.6	(0.3)^a	3.3	(1.8)^a
Dorset	−0.3		NA		NA		2.7	(0.7)^a
Toronto East	0.3		4.5	(2.4)	6.5	(4)	−1.3
Toronto Downtown	0.1		−1		−4.9		3.5	(2.5)^a
North Bay	0.3		1.3	(0.3)^a	1.6	(0.3)^a	0.6
Newmarket	0.1		1.8	(1.1)^a	2.8	(1.7)	2.2	(1.4)^a
Toronto West	0.2		4.2	(1.8)	7.1	(3.1)	−1.5
Mississauga	0.3		2.1	(0.9)^a	3	(0.6)^a	1
Oakville	1.2	(0.3)^a	2.3	(1)	3.1	(1.4)	1.2
Barrie	−1.2		1.3	(0.3)^a	2.5	(0.7)^a	1.7	(0.6)^a
Burlington	1	(0.1)^a	2	(0.4)^a	2.3		−0.5
Hamilton Downtown	0.7		4	(3.1)	5.9	(4.4)	0.5
Hamilton West	0.7		3.1	(0.4)	4.4	(0.2)	−0.6
Parry Sound	0.4		0.4	(0.1)^a	0.6	(0.2)^a	0.8
Guelph	0		1.7	(0.9)^a	2.1	(1.1)^a	2.5	(0.7)
Brantford	0.6		0.9		1.5	(0.1)^a	1.5	(0.6)^a
Kitchener	0.2		1.5	(0.3)^a	1.9	(0.4)^a	2.9	(2)^a
Sudbury	0.2		0		0.3		0.6
Port Stanley ^R	0.2		0.5	(0.3)^a	0.5	(0.3)^a	3.7	(1.7)
London	0.4	(0.2)^a	1.6	(1.3)^a	1.7	(1.3)^a	1
Tiverton ^R	−0.5		NA		NA		3.3	(1.9)
Grand Bend ^R	0.7		0.6	(0.1)^a	0.5		1.2
Chatham	0.1		1.1		1.4		1.7
Windsor Downtown	0.5		2.1	(1)	2.9	(1.4)	1.8
Windsor West	−1.8		1.4	(0.3)^a	2	(0.4)	4.2	(1)
Sault Ste. Marie	−0.1		0.5		0.6		2.2
Thunder Bay	0		2.1	(1)^a	3.7	(1.7)^a	2.5

^R indicates monitor is in a rural location. Negative values indicate mean concentrations above the five-year mean.

Not significantly lower during the pre-SOE period.