Fog shrouded, coupled with interior decoration, cooking and other indoor air pollution, many people in the use of air purifier. However, the recent AQSIQ air purifier products to carry out the national supervision of special checks, over two percent of air purifier sampling failed. The face of haze, formaldehyde and other indoor pollution, how do we choose the air purification products?

Beijing Times reporter Qian Yiyang Jinghua Times cartoon Xie Yao

Indoor air pollution is a complex source of "more than 80% of the life of people spent in the indoor environment, indoor environmental pollution than the outdoor environment on people greater impact." Beijing Health Education Association executive vice president, Capital University of Medical Sciences, .

Inorganic pollutants, such as ozone, ammonia, nitrogen oxides; respirable particulate matter, such as PM10, PM2.5; biological pollutants, such as air or air pollutants, such as air pollution; Viruses and bacteria in the dust; radioactive contaminants, such as radon.

The most important indoor pollutants from the outside, such as industrial exhaust and vehicle exhaust in the natural ventilation or mechanical ventilation under the effect of being transported to the interior. According to statistics, public places in the haze weather even if the doors and windows closed, the indoor concentration of PM2.5 and outdoor fog is still very close.

Part of the indoor pollutants from the decoration and decoration materials, such as furniture release of harmful substances mainly free formaldehyde, which comes from wood-based panel adhesive. Manufacture of furniture used in the plastic, paint, paint contains a lot of benzene, toluene and xylene. If the drying is not complete, the use of the process will be slow release.

Cooking is also an important factor in the generation of indoor pollution, the main pollutants are fumes and combustion of two types of smoke; in the cooking process, due to thermal decomposition produce a large number of harmful substances, have been identified substances include aldehydes, ketones, hydrocarbons, , Aromatic compounds, heterocyclic compounds, a total of more than 220 kinds. In addition, China's urban residents to coal, liquefied petroleum gas or natural gas as fuel, these fuels combustion process will produce carbon monoxide, nitrogen oxides, hydrogen cyanide, carbon dioxide, sulfur dioxide and incomplete oxidation of hydrocarbons, solid particles.

Tobacco smoke pollution is also more common indoor air pollution. Tobacco smoke is known to contain at least 3,800 ingredients, including nicotine, polycyclic aromatic hydrocarbons, aldehydes and other harmful substances up to hundreds of species.