Haze is here. Is it so magical in Dongguan to fire the "artifact of haze control"?

Yesterday afternoon, Dongguan used fog cannon vehicles to reduce the haze in the surrounding areas of the Guancheng District Government

On the 12th, the air quality in the province gradually deteriorated, and the convergence zone of the north-south wind field on the ground just appeared in Guangzhou, Foshan, Dongguan, Jiangmen, Shunde, Zhongshan and Zhaoqing

At 8:55 yesterday, the Dongguan Meteorological Observatory issued a yellow haze warning signal, saying that there was a moderate haze weather in Dongguan with visibility below 5 kilometers.

Based on the air quality pollution that will continue for several days, the Dongguan Environmental Protection Bureau has taken measures such as key inspections and restricted construction sites in key areas in accordance with the previously formulated plan, and also tried to use fog cannons to reduce haze for the first time

The scientific name of the fog cannon is a multi-function dust suppression vehicle.

According to on-site staff, a fog cannon is worth about 700,000 yuan, and two drivers and maintenance personnel are required after it is put into operation on a daily basis

dispute

Is there such a magical "artificial haze treatment"?

In 2014, similar fog cannon cars appeared on the streets of Xi'an, which caused a lot of controversy at that time

Shan Zhiwei, deputy dean of the School of Materials Science and Engineering of Xi’an Jiaotong University, said in an interview with the media, “This type of fog cannon is effective in reducing dust in some areas, but for large-scale and long-term smog management, it is not It cannot reduce the concentration of PM 2.

He introduced that the operating principle of the fog cannon is not complicated-the fan sprays a large amount of water into the air, and the water will atomize, react with the dust in the air, and fall to the ground together

Pan Xiaochuan, an environmental and health expert at the School of Public Health, Peking University, also said that it is a bit exaggerated to say that this kind of car is a "haze control artifact".

"It's useless for small particles

After more than a month of debugging, Dongguan used fog cannons to reduce haze for the first time yesterday afternoon

Fog Cannon File

Scientific name: Multifunctional dust suppression vehicle

Price: about 700,000 yuan

Structure: Mainly composed of three parts: fan, unit and water tank

Principle: The unit uses high pressure to atomize the tap water into particles of the same size as the dust.