This is not a joke.
According to Europe China Daily, PM2.5 matter—fine, articulate matter emitted by motor vehicles, which causes health problems like lung irritation, coughing, sneezing and even heart problems—touched 886 micrograms per cubic meter (measurements by the US embassy in Beijing). This is 35 times the prescribed limit by the World Health Organisation (WHO).
PM2.5 levels reached 1500 in Beijing during Chinese New Year 2012.
The extreme pollution led to extreme measures, as shown in this video.
Their air is our air.
Something to think about.