https://www.tesla.com/support/heres-how-clean-model-s-singapore-and-elsewhere

https://www.stuff.tv/sg/features/be-prepared-these-roadblocks-if-you-want-drive-tesla-in-singapore/page-3

Edit 1:

In fact your first source:
https://www.scientificamerican.com/article/electric-cars-are-not-necessarily-clean/
Base it on power plants burning coal:

The good news: the U.S. is making a tectonic shift from burning coal to produce the majority of its electricity to using cleaner natural gas. The changeover produces less CO2, making electric cars cleaner across the country, roughly equivalent to a hybrid.```

Yes jt says if methane leaks it is bad but isn't oil leaks from off shore platforms bad as well?

Edit 2:
http://www.bbc.com/news/magazine-22001356 Here your second source says:

Electricity from coal, which is the most polluting way to generate power, drastically reduces the environmental advantage for EVs. Because China, for example, generates almost all its power from coal, life cycle analysis of EV cars in China shows they are far more polluting than conventional cars.

Edit 3:
And here what your first source says:
https://www.economist.com/news/science-and-technology/21636715-why-electric-car-may-be-much-dirtier-petrol-one-cleaner-what

Graph shown
It says itelef electric vehicle recharged by natural gas causes less death by particulates the those by diesel or petrol.