A long-term study of the snowpack in Austria shows that global pollution-reduction efforts have paid off with big reductions in sulfate and nitrate concentrations. The pollutants are primarily from industrial sources and from cars and trucks and are carried to the Alps by prevailing winds. As snow and glacier ice melt, the pollutants run off into rivers and streams.
The study sites have been monitored since the 1980s and the results how that sulfate pollution has been reduced by 70 percent, while nitrate levels are down about 30 percent.
Read the entire report here: https://www.zamg.ac.at/cms/de/klima/news/langzeitstudie-am-sonnblick-gletscher-deutlich-weniger-luftschadstoffe-in-der-schneedecke
Global Warming in the Alps 