growth of PM.5 tiny particulate matter concentration tha

that could at least double the readings,” Zhang said. He added that this could help explain the o

ccurrence of heavy PM2.5 pollution that lasts for an extended period of time in certain regions.

Zhang said the interaction of air pollution and meteorologic

al conditions could be triggered when PM2.5 density reaches 100 micrograms per cubic meter in ma

ny of the monitoring points of a region. In such situations, more solar radiation wil

l be reflected back into the space, resulting in temperature inversion and further stabilizing the ground atm

osphere. And the height of the mixing layer could decrease to only one-third of that w

hen pollution processes begin, exacerbating particulate concentration levels even further.

The center’s research also showed that global warming is increas

ing the number of days with a stable surface atmosphere in n

orthern China, especially in the cluster, making smog more likely to develop.