The higher the floor, the better the air? Almost the same as the first floor

Floors 9-11 were once considered to be dust layers with heavy pollution. Is this reasonable? A reporter from Modern Express learned yesterday from the Environmental Disease Control and Prevention Center of the Jiangsu Provincial Center for Disease Control and Prevention that experts randomly sampled indoor PM2.5, PM10 and other values ??from nearly 100 households in Nanjing. The results found that there was no significant difference in PM2.5 values ??regardless of the floor level. . Experts also said that research shows that people over 74 years old are a group sensitive to air pollution, and pollution can cause a significant increase in non-accidental deaths in this group. In order to deal with haze, Jiangsu took the lead in establishing a haze health impact monitoring network.

Modern Express reporter Yu Yuehua, Ma Lele and Liu Jun

It turns out that we have been misunderstanding the 9-11 floors for so many years...

There have been rumors

The 9-11th floor is the dust layer with the highest concentration of PM2.5

“The 9-11th floor, don’t think it’s neither high nor short, and the price is not expensive. Everyone is rushing to buy it. This is Big mistake. These layers happen to be the dust layers. Dirty particles will stay at this height. The concentration of PM2.5 is the highest and they are the dirtiest layers. "It is said that in major cities that are shrouded in smog from time to time. The sales lady’s remarks about “black floors” once caused an uproar.

So, what do developers think? Mr. Ren, who has 10 years of experience in real estate sales in Nanjing, said: "There has always been a saying that the place 25-30 meters above the ground is the 'dust layer', and the corresponding floor is around the 10th floor. Many house buyers believe this. It really does. As a developer, we have never found the exact scientific basis, but since many home buyers believe it, we can’t say anything.”

He said that the common practice among developers is to The term "dust dust" is not actively mentioned in real estate sales. Generally, the houses on the 10th floor are bought by people who don't know or don't believe in "dust dust layer" - and judging from the actual pricing of developers, there is no such thing. It reflects the "dust layer" because the houses around the 10th floor are not cheap.

It has not changed

Not affected by rumors, the higher the floor, the more expensive it is

Mr. Ren said that the basic principle of developers’ pricing of residential buildings is “the higher the floor, the more expensive it is.” : "The prices on the 1st to 5th floors will be significantly lower, and the prices on the 5th to 10th floors are also relatively cheap. From the 10th floor upwards, the prices will increase significantly, and the prices on the 25th to 30th floors are the most expensive in this building. The prices on the 31st to 33rd floors will gradually decrease.”

He explained that the general principle of “the higher the price, the higher the price” is mainly due to lighting and views. After all, in high-rise residential areas, living high up is important. The lighting is relatively better; if the landscape of the community is well done, the view from a high place will be better, and the house price will naturally be more expensive. He said that generally the lighting below the 5th floor will be poor, so the pricing will be significantly cheaper; the lighting on the 5th to 10th floors is also easily affected; the lighting and views on the 25th to 30th floors are very good, and the pricing is the most expensive; the 33rd floor is the top floor, There will be concerns about water leakage, so it is cheap; there may also be hidden dangers of water leakage on the 31st and 32nd floors, so the price will be lower.

Modern Express reporter found the pricing of a real estate property from the Internet and found that it was similar to what Mr. Ren said. Regarding the pricing of a 33-story residential building in Shenglong Tianhui, southwest of Hexi Province, the unit price on the first floor is only 24,840 yuan, while the unit price on the second floor is increased to 26,340 yuan. The third and fourth floors are both 27,340 yuan. The fifth floor is 500 yuan more than the fourth floor. Yuan.

Starting from the 6th floor, the house price has reached the 28,000 yuan mark, and every time you go up one floor, the unit price becomes 100 yuan more expensive. Up to the 30th floor, the unit price reaches the highest for this unit, which is 30,440 yuan. The unit prices on the 31st, 32nd, and 33rd floors have dropped to 30,140, ??29,640, and 28,140 yuan respectively. The unit price on the top floor of the 33rd floor is the same as that on the 7th floor.

Monitoring results

There is little difference in PM2.5 values ??on different floors

Zhou Lian, deputy chief physician of the Environmental Disease Control and Prevention Institute of the Provincial Center for Disease Control and Prevention, said that residents’ homes PM2.5 mainly comes from the infiltration of pollutants in the outdoor air, as well as indoor decoration pollution or people smoking, including cooking fumes, and human activities.

They sampled the indoor air of nearly a hundred households. The highest floor was the 28th floor, and most of the others were concentrated on the 15th floor and below. During the inspection, residents are first required to close the doors and windows of their homes to keep the indoor space in a relatively airtight state. As a result, the detection data showed that the indoor PM2.5 values ??on each floor were lower than those outdoors, but there was no significant difference between different floors. "Indoor air quality has little to do with the height of the floor." Zhou Lian said.

The indoor air of residents close to the roadside is poor

In addition, Zhou Lian’s team also tested PM10 concentrations in different places in Jiangsu.

The test found that about 60% of PM10 (particle diameter less than 10 microns) is PM2.5. The concentration of PM10 varies greatly in different places.

“Places with a large flow of people, including shopping malls, supermarkets and other places where people smoke indoors, have relatively serious air pollution. As for accommodation places such as hotels, if the surrounding environment is relatively good, the concentration of indoor particulate matter will be low. "The air quality is relatively good." In addition, he also said that the indoor air quality of houses close to the road is worse than those not close to the road.

(The above answer was published on 2016-01-15, please refer to the actual relevant current house purchase policies)

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