Empa has also contributed to this: "When ICOS Cities was launched, we already had a CO 2 measurement network throughout Switzerland, including in Zurich ... and trees from Uetliberg to Irchel.

The best time to visit Zurich is between June and September ... admire the brilliant fall foliage that blankets the city and Uetliberg. Key Events: Winter is a mixed season.

The entire area is partially linked by the planetary path from Uetliberg, about 5 miles away, so many hikers make the walk from Zurich. It's also home to the Albis Nordic Walking Park (six trails ...