Study finds vehicles more important source of urban atmospheric ammonia than farms
Green Car Congress
MARCH 31, 2017
Reductions in fleet NH 3 emissions are slow or insignificant in US cities in recent years due to modest reduction in NH 3 emissions from new vehicles and increasing emissions from older vehicles (though with their TWCs still active). ppbv/ppmv, 15% uncertainty) despite differences in fleet composition, climate, and fuel composition.
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