The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Lead concentrations have been measured in the ambient air of Helsinki since 1978. The mean air concentrations at various stations reached maximum values in 1980 of 333-1150 ng/m 3 . From 1980 to 1996 the concentrations decreased to one-hundredth, from 745 to 7 ng/m 3 , at the two centrally situated stations where measurements were made continuously. Concomitantly, the estimated annual...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.