A single fare for the entire public transport network will be offered at the same time.At the French Open in Paris, top seed Sinner appeared to be cruising to a victory before suddenly taking a turn for the worse, leading some to suspect heat was a factor in his shock defeat.The Italian complained of dizziness and feeling lethargic before hitting a wall, but refused to blame the sweltering conditions on court."It was a tough spot to be in," he commented afterwards, but added: "Really it was nothing against the heat, nothing against the weather. It was just me today, but it happens."Meanwhile, Italy's red alert in Rome - as well as in Florence, Bologna, Brescia and Turin - is the first of the year, warning of "possible negative effects on the health of healthy, active people".Temperatures will climb to 35C in Madrid over the weekend. Though the current spell does not officially qualify as a heatwave in Spain, the nation's meteorological office has said the heat is that usually seen in July and August.EPATennis world number one Jannik Sinner bowed out of the French Open after complaining of dizzinessThe immediate cause of the heatwave is a "heat dome" - an area of high pressure that becomes "stuck", trapping warm air underneath it.While it is difficult to link individual extreme weather events to climate change, scientists say climate change makes heatwaves more frequent and more intense.Over the last 30 years, Europe has been warming by 0.56C per decade, according to the Copernicus climate service - enough to make heat extremes significantly more severe.The UN warned on Thursday that global average temperatures were likely to continue at or near record levels this year and for the next four years.The 11 hottest years ever recorded all happened from 2015 onwards, and the UN's weather and climate agency said this trend was predicted to continue, with a new hottest-ever year "likely" before 2031.French Open: Gauff and Sabalenka in action after Sinner's shock exitWhy temperature records are being not only broken but smashedTwo more boys die in latest heatwave water deathsParis 'punishingly hot' as Western Europe hit by heatwaveEuropeFranceClimateItalyPortugalEurope heatwaves
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