Table 3.

Average daily concentration of PM_2.5, PM₁₀, NO₂ and SO₂ (μg/m³) in Wroclaw, Lodz, Krakow, Warsaw and Gdansk during March–May 2018–2020.

Cities		2018			2019			2020			Relative % Change
											2020 vs 2018			2020 vs 2019
		March	April	May	March	April	May	March	April	May	March	April	May	March	April	May
Wroclaw	PM2.5	37.9	19.7	15.3	18.8	21.3	13.3	20.9	16	10.5	−45	−18.9	−31.2	11.1	−24.7	−21.1
	PM10	43.1	31	23.3	28	33.5	19.2	26.7	26.8	14.1	−37.9	−13.5	−39.6	−4.3	−20.1	−26.9
	NO2	32.6	26.9	24.6	24.1	26	23.3	24.1	23.4	22	−25.9	−12.8	−10.6	0.3	−9.9	−5.3
	SO2	4.9	2.6	2.4	3.9	5.2	2.7	5.1	5.8	3.2	4.3	127.3	33.7	29.8	11.1	18.5
Lodz	PM2.5	32.9	16.6	12.2	18.5	19.2	12.9	20.8	14.2	10.2	−36.9	−14.7	−16.3	12.5	−26.4	−20.7
	PM10	47.5	33.1	26.9	29.6	40.5	22.7	35.9	34.6	20.8	−24.5	4.6	−22.7	21	−14.5	−8.5
	NO2	32.6	26.9	24.6	20.7	31.9	22.3	25.4	24.2	20.4	−22	−10.1	−17	22.6	−24.2	−8.5
	SO2	9.6	3.8	2.3	5.2	3.8	2.6	4.6	3.9	2.7	−52.4	2.1	17.6	−13	3.7	1.2
Krakow	PM2.5	52.7	24.4	19.1	26.7	24.4	15.7	27.3	21.7	14.4	−48.2	−11.2	−24.8	2.3	−11.1	−8.7
	PM10	69.8	41	29.9	38.6	36.3	23.3	36.7	33.2	21	−47.3	−19	−29.8	−4.8	−8.6	−9.9
	NO2	47.4	44.4	38	40.6	40.2	35.1	34.8	31.9	28	−26.6	−28.2	−26.3	−14.2	−20.7	−20.2
	SO2	11.3	4.8	5.1	7.2	5.6	3.7	5.3	5	3.6	−53.5	3.4	−28.8	−26.7	−11.2	−1.4
Warsaw	PM2.5	35.7	20	13.3	19.8	21	14	24.5	16.7	12.3	−31.5	−16.4	−7.8	23.4	−20.4	−12.4
	PM10	47.5	35.6	29.3	28.4	36.2	21.9	33.3	31.9	19.7	−29.9	−10.4	−32.9	17.2	−11.8	−9.9
	NO2	37.7	37.7	30.2	33.3	29.6	30.6	28.3	27.1	24.6	−25.1	−28.2	−18.7	−15.2	−8.6	−19.6
	SO2	–	–	–	3.7	2.4	0.9	4.3	3	2.7	–	–	–	16	27.7	190.8
Gdansk	PM2.5	21.9	16.9	13.7	–	–	–	24.4	12.5	9.4	11.4	−25.6	−31.4	–	–	–
	PM10	25.5	22	18.8	14.2	28.2	18.7	23.4	18.6	12.8	−8.4	−15.2	−31.5	64.2	−33.9	−31.5
	NO2	19.9	17.1	13.8	12.8	17.1	12.2	16.3	11.7	8.4	−18.4	−31.7	−38.7	27.3	−31.7	−30.8
	SO2	3.9	4.5	2.7	2.3	2.5	1.9	4.4	3.7	2.6	12.8	−18.3	−4.5	86.4	49.6	37.6