Kuala Lumpur, and most of Malaysia in fact, were wreaked by this local regular event known as the haze. Caused by rampant jungle blazes from local and / or neighbourly sources, these sudden drop in visibility and sudden rise in respiratory problems can be somewhat infuriating.
The dark skies over on the left side of the second image was a tell-tale sign of rainfall. But that was what it turned out to be: just a sign. It drizzled a bit about ten klicks away in PJ.