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Australia took the initiative to warn the World that breathing in Hong Kong, China is hazardous to your health and strongly urges you not to.
"People with existing heart or respiratory illnesses should reduce physical exertion and outdoor activities on days when very high pollution levels are recorded," said spokeswoman for the Australian consulate in Hong Kong told AFP. And that, "..levels of air pollution in Hong Kong may aggravate bronchial, sinus or asthma conditions."

Hong Kong's air quality has come under increasing scrutiny in recent years, as the city is obviously blanked under a thick haze. The government is currently reviewing the city's air quality targets. Which was last revised 20 years ago. Blue Sky