Table 4.

Results of the elemental analysis (in ng m⁻³) of PM₁ and PM₁₀ samples between 14 March and 18 May over the period 2015–2020.^a.

	PM1						PM10
	2015	2016	2017	2018	2019	2020	2015	2016	2017	2018	2019	2020
K	59	67	56	53	38	23	146	125	180	162	148	89
Ca	262	355	161	177	171	42	1212	1006	1259	1169	1062	403
Tib	─	─	─	─	─	─	13	9	13	14	12	9
Mn	4	5	5	4	5	3	11	9	12	12	12	8
Fe	87	98	70	70	73	47	335	259	371	345	335	156
Ni	5	6	6	5	4	3	9	8	10	9	9	4
Cu	6	7	6	5	4	4	16	13	18	16	16	7
Zn	12	15	10	12	10	8	21	22	21	23	19	13

^aConcentrations below detection limit were replaced by detection limit.

^bThe percentage of data above the detection limit for PM₁ was lower than 70 %.