Brussels

Alder + Hazel

Latest measure: 
Wednesday, 7 January, 2026
20252026Mean 2016 - 202507 Jan14 Jan21 Jan28 Jan04 Feb11 Feb18 Feb25 Feb04 Mar11 Mar18 Mar25 Mar01 Apr050100150200250300350400450500550600grains / m³

Ash

Latest measure: 
Thursday, 1 May, 2025
2025Mean 2016 - 202518 Feb25 Feb04 Mar11 Mar18 Mar25 Mar01 Apr08 Apr15 Apr22 Apr29 Apr020406080100120140160180200220240260280300grains / m³

Birch

Latest measure: 
Friday, 23 May, 2025
2025Mean 2016 - 2025threshold value11 Mar18 Mar25 Mar01 Apr08 Apr15 Apr22 Apr29 Apr06 May13 May20 May0100200300400500600700800grains / m³

Oak

Latest measure: 
Tuesday, 27 May, 2025
2025Mean 2016 - 202501 Apr08 Apr15 Apr22 Apr29 Apr06 May13 May20 May27 May0100200300400500600700800900grains / m³

Grasses

Latest measure: 
Friday, 15 August, 2025
2025Mean 2016 - 2025threshold valueMayJunJulAug020406080100120140160180200220240grains / m³

Mugwort

Latest measure: 
Tuesday, 30 September, 2025
2025Mean 2016 - 202515 Jul22 Jul29 Jul05 Aug12 Aug19 Aug26 Aug02 Sep09 Sep16 Sep23 Sep30 Sep0246810121416grains / m³

Cladosporium

Latest measure: 
Wednesday, 26 November, 2025
2025Mean 2016 - 2025threshold valueMayJunJulAugSepOctNov0200040006000800010000120001400016000fungal spores / m³

Alternaria

Latest measure: 
Wednesday, 1 October, 2025
2025Mean 2016 - 2025threshold valueJunJulAugSepOct050100150200250300350400450500550600650fungal spores / m³

Basidiospores

Latest measure: 
Wednesday, 26 November, 2025
2025Mean 2016 - 2025JulAugSepOctNov0100020003000400050006000700080009000100001100012000fungal spores / m³

Sciensano, section of MYCOLOGY-AEROBIOLOGY
J. Wytsmanstreet 14, 1050 Brussels - Phone: 02/642 55 18 - Fax: 02/642 55 19 - E-mail: airallergy@sciensano.be

https://www.sciensano.be