Johnson Matthey has already faced a drag to its earnings result from U.S. tariffs. Yet, it faces two further risks in its catalytic convertor business including the section 232 review of the automotive industry as well as duties on its component imports from China. John Walker, ED for clean air products, has indicated that “the challenge of mitigation is getting bigger” into 2019 despite success if offsetting higher costs so far. The firm may already be scaling back its reliance on China, with its U.S. seaborne imports from there down 38.6% year over year in the third quarter and by a fu...