China's communist rulers normally suppress news like that. In 2009, when the U.S. embassy in Beijing started putting air quality numbers on its Twitter feed, the government demanded in vain that it stop.
But when your air contains enough foreign matter to mold bricks, it's hard to claim the sky is blue. And lately, the authorities have decided censorship of the topic is futile.
"I've never seen such broad Chinese media coverage of air pollution," a Beijing consultant named Jeremy Goldkorn told The New York Times. "From People's Daily to China Central Television, the story is being covered thoroughly, without trying to put a positive spin on it." In November, the outgoing president actually acknowledged the need to combat environmental destruction.
Pollution is not the only detectable thing in the Chinese air lately. This month, after the government interfered with an editorial in a national newspaper based in Guangzhou, protesters mounted some of the boldest demonstrations since the 1989 Tiananmen Square movement -- while for several days, police stood by and let them.
Chants were heard that ordinarily could have brought harsh punishment: "Down with the Communist Party!" Unlike Tiananmen, these didn't end in mass bloodshed. The newspaper whose staffers had threatened to strike was not closed down.
Almost unnoticed amid all this was a report by the official news agency that the government plans to dismantle its notorious system of "re-education through labor," where petty criminals, religious people and dissidents have often been imprisoned without trial. "If it can be abolished this year, I think it's an extremely important step toward rule of law," Peking University law professor He Weifang told Reuters.
That may be expecting too much. At least since 1989, human rights advocates have hoped China would soon evolve into a freer, more democratic society, but so far they have always been disappointed.
The 2008 Beijing Olympics were supposed to push the government toward openness and tolerance. Instead, the artist who helped design the famous "Bird's Nest" stadium, Ai Weiwei, wound up in detention for making noise about official abuses. In 2011, the government mounted a particularly brutal offensive against malcontents.
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