PM 2.5 refers to airborne particulates that measure less than 2.5 microns in diameter. Because the particles of dirt and dust are small enough to travel deep into people's lungs, it is considered dangerous to people with respiratory conditions.
The main sources of PM 2.5 are automobile exhaust, chemical plants and roadway dust, Wang told the Global Times. The lack of wind failed to disperse the particles.
Shanghai's AQI had fallen to 124 at 10 pm Sunday, indicating light pollution. The PM 2.5 reading peaked at 120 micrograms per cubic meter in the morning.
The indicator began to drop after 10:00 pm Saturday as the wind began to pick up.
On Sunday, the wind was expected to die down around midnight Monday, which should lower the air quality, Wang said.
Landmark building should respect the public's feeling
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