Dust-haze is also called atmospheric brown cloud. According
to Specifications for Surface Meteorological Observation of
China Meteorological Administration, dust-haze is defined
in this way: “a huge amount of dry dust particles that are
extremely subtle are flowing evenly-scattered in air, making
air unclear with the visibility no more that 10km and bringing
yellow and red color to lighting facilities. They seem a
little blue if they are under darkness.
Nowadays, there are four areas suffering from serious
dust-haze: the Huanghuaihai area, the river valley of
Yangtze River, Sichuan Basin and Pearl River Delta.
It affects physical health. The composition
of dust-haze is very complex with hundreds of
atmospheric particles. Among them, the main
unhealthful things are aerosol particles with
diameter lower than 10 micrometers like mineral
particles, sea salt, sulfate, nitrate, organic
aerosol particles and so on. They can enter
humans’ upper and lower respiratory and lung
lobes and stick onto them.
Most of the aerosol particles can be inhaled
into human respiratory, especially for sub-micron
particles of which the stimulation in the upper
and lower respiratory and pulmonary alveolus causes
inflammations like rhinitis and bronchitis, etc.
Because of this, being in dust-haze for too long
increases the risk of a lung cancer.
Besides, the ultra violet ray in sunshine is
the only way for human bodies to compound vitamin
D. Weakened ultra violet ray is the direct cause
of the prevalence of rickets in children. What’s
more, ultra violet ray is a vital natural weapon
for killing atmospheric microorganisms like bacteria
and virus. Dust-haze takes off the edge of ultra
violet ray in surface layer, which easily makes
infectious bacteria more activated and increases
It affects mental health. Dust-haze triggered
pessimistic mood, which can be out of control
without timely adjustment.
It affects traffic safety. Low visibility
comes along with dust-haze and as the pollution
lasts, the traffic congestion brings frequent accidents.
It affects regional climate. This causes that
extreme regional climate goes with increasing frequency
and meteorological disasters happen in series. What people
are more worried about is the earlier appearance of
photochemical smog pollution.
Photochemical smog pollution is a kind of light
blue smog as an outcome of the chemical reactions between
lots of oxynitride and oxycarbide in the waste gas from
cars and factories. Its main components is a series of
oxidizing agents like ozone, aldehydes, ketone and so on.
They are highly toxic and have strong stimulation on human
bodies. In serious situations, people suffer from dyspnea,
failing eyesight, tetany and so forth.