https:\/\/www.ilmatieteenlaitos.fi\/uutinen\/3vhx5GIOPEYRSiEFzHO6FF<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"Ilmatieteen laitoksen tuoreet tutkimukset osoittavat, ett\u00e4 liikenteen pakokaasup\u00e4\u00e4st\u00f6jen vaikutus kaupunkien ilmanlaatuun on v\u00e4hentynyt selv\u00e4sti viimeisen vuosikymmenen aikana. Samalla renkaiden, jarrujen ja tienpinnan kulumisesta sek\u00e4 katup\u00f6lyst\u00e4 syntyvien hiukkasten merkitys korostuu. Helsingiss\u00e4 tehdyt pitk\u00e4aikaiset mittaukset osoittivat, ett\u00e4 muun muassa typen oksidien, mustan hiilen ja hiukkasten lukum\u00e4\u00e4r\u00e4pitoisuudet ovat v\u00e4hentyneet merkitt\u00e4v\u00e4sti. 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