This emerges from a study by the Institute of Catalysis and Environment in Lyon (IRCELYON, CNRS / University Lyon 1) and the Leibniz Institute for Tropospheric Research (TROPOS) ...
„In rooftop experiments in Germany, the researchers tracked the content of grime in both sunshine and shade. ... In the latest experiments he worked with colleagues in Leipzig, Germany, to shift the work outside.“
„According to the researchers -- who analyzed data collected during a six-week field study in Leipzig, Germany, and an ongoing year-long study in Toronto -- sunlight can break down grime and release the smog-forming compounds.“
„Based on a six-week field study in Leipzig, Germany, the researchers found that grime in shaded areas contained 10 per cent more nitrates than grime exposed to natural sunlight, which was consistent with their laboratory findings.“
