BBC: The number of foggy, misty and hazy days is diminishing across the continent, say scientists who have analysed the meteorological data. The researchers found this clearing of the air in the past 30 years may have amplified the warming of Europe. They report their findings in the journal Nature Geoscience. The research was led by Robert Vautard at the Atomic Energy Commission, Gif sur Yvette, France. Since the 1970s, European temperatures have risen by about …