Table 3.

Average concentrations (μgm⁻³) and standard deviations of NO₂, O₃, and PM₁₀ for time periods March 14th–June 21 (during lockdown) and June 22^–August 31 (post-lockdown) together with the percentages of change (lockdown versus pre-lockdown and post-lockdown versus lockdown)

	February 15–March 13, 2020 (pre- lockdown) lockdown)	March 14–June 21, 2020 (lockdown)	% of change respect to pre-lockdown	June 22–August 31, 2020 (post-lockdown)	% of change respect to pre-lockdown
NO2
Gràcia	40.7 ± 5	21.5 ± 4	− 47%	26.0 ± 3	− 36%
Vall d’Hebron	27.7 ± 5	16.0 ± 4	− 42%	18.8 ± 2	− 32%
Granollers	38.0 ± 5	16.4 ± 4	− 57%	20.2 ± 3	− 47%
Fabra Observatory	10.3 ± 2	5.9 ± 2	− 43%	8.5 ± 1	− 17%
Manlleu	24.2 ± 2	10.5 ± 3	− 57%	10.4 ± 2	− 57%
Begur	4.9 ± 1	1.9 ± 0.4	− 61%	2.2 ± 0.4	− 55%
Bellver de Cerdanya	7.9 ± 2	2.9 ± 1	− 63%	4.8 ± 2	− 39%
Juneda	7.5 ± 1	5.5 ± 1	− 27%	5.2 ± 1	− 31%
O3
Gràcia	43.4 ± 5	61.6 ± 7	+ 42%	51.9 ± 4	+ 20%
Vall d’Hebron	54.1 ± 5	67.3 ± 6	+ 24%	62.5 ± 5	+ 16%
Granollers	35.0 ± 5	57.4 ± 7	+ 64%	56.4 ± 4	+ 61%
Fabra Observatory	73.3 ± 3	86.6 ± 9	+ 18%	85.3 ± 7	+ 16%
Manlleu	31.1 ± 7	46.8 ± 6	+ 50%	55.1 ± 6	+ 77%
Begur	67.5 ± 2	77.8 ± 9	+ 15%	78.1 ± 5	+ 16%
Bellver de Cerdanya	46.4 ± 7	51.4 ± 3	+ 11%	58.1 ± 7	+ 25%
Juneda	46.9 ± 12	58.0 ± 6	+ 24%	63.1 ± 6	+ 35%
PM10
Gràcia	28.3 ± 5	18.5 ± 3	− 35%	22.8 ± 3	− 19%
Vall d’Hebron	21.4 ± 3	13.0 ± 3	− 39%	17.8 ± 2	− 17%
Granollers	32.1 ± 4	19.5 ± 3	− 39%	24.2 ± 2	− 25%
Fabra Observatory	17.2 ± 3	12.5 ± 2	− 27%	16.7 ± 2	− 3%
Manlleu	32.1 ± 4	18.9 ± 4	− 41%	23.0 ± 2	− 28%
Begur	n.d	n.d	n.d	n.d	n.d
Bellver de Cerdanya	13.2 ± 3	9.9 ± 3	− 25%	15.1 ± 3	− 14%
Juneda	21.3 ± 4	15.3 ± 2	− 28%	20.8 ± 3	− 2%

n.d. no data available