The Swiss Meteorological Office reported that a record 34.8C was set in Basel and warned of both forest fires in the persistently drought-hit southern canton of Valais. The Swiss Health Office offered the public safety advice. The ozone level rose badly and was more than twice the permitted level at 257 microgrammes per cubic metre in Lugano on Friday, and things were in a generally bad condition across the Swiss Alps as a whole. Extreme heat and ozone levels were also harming tourists at the Gotthard Road Tunnel on the 8th and 9th.