Netizens broadcast the excessive environmental protection department of Hangzhou PM2.5 index: definitely wrong

Data from a mobile phone application software, Hangzhou Environmental Protection Department clarified yesterday - two days, Hangzhou PM2.5 monitoring value is not exceeded

Yesterday morning, a post in a local online forum in Hangzhou released the PM2.5 air pollution index in Hangzhou on March 21. The value was 165.

This post looks like "there is a picture and the truth" and it has attracted wide attention for a while. Is the post posted content reliable?

Yesterday, the staff of the Hangzhou Environmental Protection Bureau stated that the monitoring work of Hangzhou PM2.5 has been carried out normally, but the data has not been officially announced. In fact, at 8:00 a.m. yesterday morning, there was no such high index of 165 in the monitoring data of Hangzhou monitoring sites.

Although it is not yet possible to announce specific values, Professor Hong Shengmao of the senior engineer at the Environmental Monitoring Center Station of Hangzhou Municipality said that from the data of the two days, the PM2.5 in Hangzhou is in the normal range. Please rest assured.

Air monitoring data in the post, from mobile application software

The specific content of the post titled "The March 21, Hangzhou PM2.5 Air Pollution Index broadcast" is as follows:

Ladies and gentlemen, don't look at the weather in Hangzhou today. It's sunny. But the rain stopped. The PM2.5 value has risen. Let's see it. The air was still around 8am yesterday, only about 85. Double oh!

Pro-sensitive group of children, old and young, take a mask to go out!

The poster also sent a set of pictures. One of the pictures (see the left picture) has not only the index display, but also the “pollution ranking 31” and the “reducing outdoor sports and going out with a mask”. Regarding the source of the data, there is a line of small prints underneath the entire group of pictures: shared from the “National Air Pollution Index”.

The reporter then learned that "National Air Pollution Index" is a mobile application software.

Yesterday afternoon, the reporter also downloaded the application software with a mobile phone. The software introduced that “the air quality index and air pollution index of 120 major cities across the country can be broadcasted in real time”. After users download the software, they can select this city in the list to get this. City's corresponding air monitoring data.

However, after the reporter chose “Hangzhou”, the corresponding test data has been shown to be blank. In fact, only Beijing and Guangzhou have released PM2.5 monitoring data.

By 8 o'clock last night, more than 2,000 people had read this post, and many of them also said that they had downloaded the software but they did not get the monitoring value of Hangzhou PM2.5.

Environmental Protection Department: The data mentioned in the net post “is definitely wrong”

165 This value is accurate? Yesterday, the reporter consulted with the Hangzhou Environmental Protection Agency.

"We have not released PM2.5 monitoring data." The relevant staff of the Hangzhou Environmental Protection Bureau affirmed the reporter.

The picture posted on the post seems to be professional. Will it be the internal staff of the Environmental Protection Agency? The staff member said "impossible."

He said that, in fact, they had seen similar posts the day before yesterday. The poster posted the PM2.5 monitoring index at 8 am on March 20th, which is 85, “Whether it is 165 on March 21 or March 20th. 85, these two indexes are definitely wrong."

There are currently seven PM2.5 monitoring sites in Hangzhou, including Zhaohui, Xiasha, Hangzhou Iron and Steel, Botanical Garden, Xixi Wetland, Xiaoshan and Yuhang. The staff verified that at 8 o'clock on March 20th, the index of PM2.5 monitoring sites in Hangzhou was below 85.

“We are also wondering how the data sent by netizens come from?” the staff of Hangzhou Environmental Protection Bureau said.

The reporter also tried to contact the poster, but never received a response. Later, the post displayed on the home page was gone.

In these two days, the PM2.5 values ​​of all monitoring sites in Hangzhou were within the normal range.

Yesterday, Hongsheng Mao, a professor at the Environmental Monitoring Center of the Hangzhou Environmental Monitoring Center, noticed this post.

He said that the air pollution index (PM2.5) 165 mentioned in the post was not a direct value obtained during monitoring, but that monitoring data was derived after conversion. Professor Hung calculated that if the PM2.5 index on March 21 is 165, the measured value of PM2.5 is about 100 micrograms/cubic meter. "This value has gone beyond the normal range. If this is the case, the sky in Hangzhou should be obviously grey, not as clear as it was yesterday."

Professor Hong specifically looked at the monitoring data of PM2.5 in Hangzhou on March 20 and 21. “All of them are fairly normal and meet the standards.”

What he called “standard” means that the 24-hour average concentration limit is 75 μg/m3.

Then, when is the PM2.5 data from cities such as Hangzhou officially announced? The Hangzhou Environmental Protection Bureau stated that it is still waiting for deployment in the province. The Zhejiang Provincial Environmental Protection Agency stated that the specific time has not yet been set, but it has been “fast”.

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