Emergency clean air
It's the first weekday of Beijing's emergency clean air measures. The city has ordered construction sites to shut down, it's ordered factories to cut down emissions, and it's taken more than a million cars off the streets.
These are the final steps that this city has planned in order to fulfill its promise of clean air for the Olympic Games. We've been testing Beijing's air particle pollution for the last two weeks with our own hand-held detector. Here are our results (and pictures).
At about midday, we went to the second ring road in the centre of Beijing to see how the restrictions were getting on.
A little further on, we found a hefty crowd of people waiting for the 938 bus. Qu Ming Xia, queued up with her 12-year-old son, Yue Xin Hai - they were on their way back home from school. Normally Mrs Qu would drive. But her car's licence plate ends in an even number - so today, she and her son had to take the bus.
"We're sacrificing our convenience but this can benefit everyone," she told us, "We approve of the restrictions."
Next to the bus stop, we found a group of a dozen or so construction workers using buzz saws to fix the pavement. They appeared to be exempt from the city's ban on construction work (as are the workers fixing the last few window panes to the fairly dazzling, almost-finished new headquarters of Chinese state television).
I'm writing this entry from an office overlooking Beijing's main roads. It's now the start of the evening rush hour. Out of the window, the traffic going one way is pretty quick. But cars going the other way are bunched up - because one of the three lanes has been reserved for official Olympic traffic (of which there appears to be none at the moment.) So, in some places, the new measures mean this: fewer cars, fewer lanes, same jams.