What is the most popular topic in the second half of 2011? That is PM2.5, the air pollution problem. Especially since the autumn, the domestic big cities have appeared fog haze weather, the depressive air make it hard to breathe for the city people. Layers of fog haze show a deep truth: The air pollution is worse, and people's health is in the serious harm. But compared to the air pollution, the more terrible thing is the indoor environment pollution threats. Human spend 80% of life time indoors. The indoor air pollution is not only PM2.5. How to deal with it become a looming problem.
PM2.5 is just one of the threats to human body, but not the dangerest one. The most dangerous pollutant is Dioxin/furans,which is called King of the toxic!Even dioxins are very toxic, it is very hard to detect them for their concentration is far lower than the limit of detection of the analyzers.
Yes, PM 2.5 is only part of the environmental problem. However, it is an important indicator of the overall environmental conditions of big cities. There are many much more harmful substances in atmosphere, but the concentraction is relatively much lower and with more limited sources.
Now the main concern is not about which pollutant is more critical. The direction is that if the country is unable to improve PM2.5, we going to pay for it at the expenses of public health which is in turn a huge public costs in medical system.
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