What are fine particles? I HSY

Fine particles

Airborne fine particles are largely due to long range transport. The air in the Helsinki Metropolitan Area includes also exhaust gases from traffic, emissions from fireplaces and energy generation. The abbreviation PM_2.5 refers to fine particles.

Concentrations are high when the 24-hour average is higher than 25 µg/m³. The annual average in the Helsinki Metropolitan Area is 8–13 µg/m³.

Time	Mannerheimintie	Kallio	Vartiokylä	Pirkkola
15.10.2019 16:00	10.95	2.51	1.45	1.83
15.10.2019 17:00	8.83	2.59	1.50	1.99
15.10.2019 18:00	6.24	2.91	1.87	2.23
15.10.2019 19:00	11.85	2.19	1.88	2.52
15.10.2019 20:00	11.94	1.13	1.42	2.03
15.10.2019 21:00	10.92	3.32	1.76	1.67
15.10.2019 22:00	13.48	3.05	2.92	1.83
15.10.2019 23:00	7.90	2.49	2.36	2.16
16.10.2019 00:00	4.76	4.36	2.86	2.57
16.10.2019 01:00	4.81	3.03	2.69	2.69
16.10.2019 02:00	5.03	2.19	2.57	2.59
16.10.2019 03:00	5.29	0.81	2.38	2.71
16.10.2019 04:00	5.81	2.15	2.68	2.76
16.10.2019 05:00	5.45	1.26	2.85	3.00
16.10.2019 06:00	4.87	2.80	3.01	3.26
16.10.2019 07:00	4.79	3.10	3.36	3.56
16.10.2019 08:00	4.52	4.46	3.74	4.51
16.10.2019 09:00	-3.01	4.79	3.56	4.28
16.10.2019 10:00	5.02	5.02	3.83	4.29
16.10.2019 11:00	8.78	5.66	5.95	5.83
16.10.2019 12:00	7.90	6.06	6.24	6.58
16.10.2019 13:00	9.54	7.40	6.39	6.87
16.10.2019 14:00	9.34	7.13	9.06	12.18
16.10.2019 15:00	10.61	8.44	8.81	10.51

Time	Leppävaara	Luukki	Tikkurila	Lohja	Länsiväylä	Talvikkitie Tikkurila	West Harbour
15.10.2019 16:00	6.42	3.54	4.86	2.45	4.85	2.24	2.20
15.10.2019 17:00	4.44	1.24	5.96	3.15	4.73	2.95	0.86
15.10.2019 18:00	4.23	1.48	6.53	3.68	4.47	4.52	1.95
15.10.2019 19:00	4.60	3.06	6.75	3.90	3.44	3.46	1.94
15.10.2019 20:00	1.72	4.56	5.52	3.77	2.30	2.75	0.06
15.10.2019 21:00	2.14	4.33	5.43	3.52	2.62	5.15	2.86
15.10.2019 22:00	2.64	-2.44	4.57	2.58	2.88	2.74	2.30
15.10.2019 23:00	2.21	2.85	3.27	2.11	3.69	1.74	3.62
16.10.2019 00:00	3.94	3.73	3.76	2.54	3.60	1.15	2.82
16.10.2019 01:00	4.14	5.39	4.59	3.33	3.30	1.91	2.24
16.10.2019 02:00	5.61	5.81	4.58	3.31	3.11	2.48	2.44
16.10.2019 03:00	2.78	4.05	3.38	3.37	2.80	1.14	0.00
16.10.2019 04:00	4.25	3.35	3.23	2.98	2.94	0.60	1.93
16.10.2019 05:00	2.34	3.45	4.49	3.04	3.26	1.92	1.26
16.10.2019 06:00	3.26	2.86	4.69	3.55	3.35	2.47	1.97
16.10.2019 07:00	3.80	4.22	4.53	3.75	3.78	4.09	2.05
16.10.2019 08:00	2.00	3.19	5.87	4.83	3.98	3.66	4.72
16.10.2019 09:00	5.17	5.33	5.95	5.47	4.35	3.35	30.80
16.10.2019 10:00	5.87	3.49	6.75	6.47	4.61	4.02	8.32
16.10.2019 11:00	6.03	4.02	6.69	6.43	6.13	4.68	6.86
16.10.2019 12:00	7.67	5.30	7.07	7.29	6.88	5.42	6.10
16.10.2019 13:00	6.45	8.46	8.87	8.51	7.45	6.37	7.29
16.10.2019 14:00	7.40	6.96	9.44	10.23	8.17	7.38	6.23
16.10.2019 15:00	8.83	6.32	8.38	8.16	10.20	4.88	7.09

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Fine particles

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