Sure, many countries are still on coal. But there are other considerations as well. Cities are hotspots for emissions, and need not be. Another important point is that nitrogen byproducts form simply from the high temperatures in internal combustion engines, not just from fuel.
Sure, many countries are still on coal. But there are other considerations as well. Cities are hotspots for emissions, and need not be. Another important point is that nitrogen byproducts form simply from the high temperatures in internal combustion engines, not just from fuel.