Switzerland's policy for improving air quality "must be pursued with determination," the agency added. "In particular, this means using more advanced technologies and introducing stricter norms for nitrogen oxide (NOx) and particulates." The agency said one reason for the smaller than anticipated decrease in polluting emissions is the projected increase in truck traffic despite the Swiss government's efforts to encourage trucks crossing through Switzerland to be put on rail cars through the use of road tolls and quotas on truck traffic. Under various scenarios, the amount of goods transiting Switzerland by rail is projected to increase from.
