„The researchers had set up grime collectors made of glass beads across the cities of Toronto and Leipzig, Germany to know the role of sunlight in the case. After six weeks in Leipzig, beads in shady areas were having 10% more nitrates than those exposed to the sun.“
„Grime in town and city centres releases an air pollutant when exposed to sunlight, new research has found. ... Real world studies in Leipzig, Germany, and Toronto proved the lab work.“
„The scientists will present their findings based on field studies conducted in Leipzig, Germany, and Toronto, Canada, at the 250th National Meeting & Exposition of the American Chemical Society (ACS), the world's largest scientific society.“
Una ricerca condotta tra Lipsia e Toronto dimostra che i sedimenti nerastri che si depositano su qualsiasi superficie, specie in città, possono causare un aumento dell'ozono nell'atmosfera
