Stock Photo - Cars pass the air monitoring station at Paracelsusstrasse in Halle/Saale, Germany, 25 September 2015. In summer 2015, the population of Saxony/Anhalt had to be warned about elevated ozone levels more often than has been the case for years. Meanwhile, fine dust pollution was at noticeably lower levels this year. PHOTO: JAN WOITAS/DPA | usage worldwide. - Halle/Saxony-Anhalt/Germany

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