It took a bit of scrolling through these photos, but I did manage to confirm that the “工大建国饭店” of the headline is the one in the southwest corner of my university’s campus. And I suspect that the second of the confirming photos shows why black snow would be falling in that area: The cars are parked right next to a coal-fired central heating plant.

And clicking through to page 2, I see right at the top the building I lived in from December 24, 2002 right through SARS to May of ’04. Two winters spent maybe 50 metres from that very central heating plant, and not once did I see any of this “black snow”. And I now live a few hundred metres north of there, and we haven’t seen any “black snow” up here.

But then the original poster, “蓝色幽灵” (Blue Spectre) leaves this odd little comment:

白天没有，只有夜里排

There’s none during the day, it’s only emitted at night.

Aha. Is management turning off some kind of emissions cleaning-up equipment overnight when nobody will notice? If so, they got noticed. And why would they do that? Would that save them money? Oh, later on there’s another comment from the original poster:

应该是有办法的，因为白天不飘黑雪，只到夜深人静时。

估计是锅炉房关闭了除尘设备。

There should be a way to deal with it, because during the day the black snow doesn’t float in the air, it’s only in the still of the night.

I reckon the boiler turns off the dust-removing equipment.

Yeah, that’s what I’d be thinking.

Anyway, like I said, I haven’t seen any of this “black snow”, but back when I lived just across the road from that central heating plant, and not this winter. But then again, I haven’t been down that way for a hell of a long time- which is odd, because one of my favourite local supermarkets is right across the road from that plant. Although, that plant’s chimney is clearly visible from most parts of the campus and it serves as my barometer on the many winter days I cross the footbridge over Xidawang Lu and enter the campus. The smoke is always white and I’ve seen no evidence of anything going wrong….

…but those photos clearly show there is a problem, and those two comments from the original poster seem to suggest that somebody in the plant may be playing silly buggers with the equipment installed to protect the local environment from the worst ravages of coal smoke, turning it off at night when nobody will notice, perhaps to save a bit of money.