People say there will be acid rain from today to the 28th. Is it true that you can’t get caught in the rain?

The acid rain text message is pure nonsense! Please read the following article: Rumors of acid rain text messages caused public concern/2010-04-23 08:50:43 Qianlong.com “From today to the 28th, please do not get exposed to the rain. Acid rain occurs once in 750 years. The risk of skin cancer is very high because of a major eruption of a volcano in Europe..." Yesterday (April 22), the city received a moderate rain. At the same time, such a line said that the rain was affected by volcanic ash. Acidic text messages were also spread among citizens, causing concern among some citizens. "The eruption of a volcano in Iceland and acid rain in Beijing are unrelated things. It is pure nonsense!" Zhang Mingying, a senior engineer at the Municipal Meteorological Bureau said, "The rainfall measured yesterday (April 22) by the meteorological department showed that the pH value 6.23, which is close to the normal value and cannot be called acid rain at all.” Ms. Zhang said on the hotline that she had just arrived at the unit yesterday (April 22) when she received a text message from a friend on her phone, which read: “From today onwards. Please don't get exposed to the rain on the 28th. There is a high risk of skin cancer if you get exposed to acid rain. This is because a large eruption of a volcano in Europe erupted into the sky, which is highly acidic. Pay attention and forward this message to those around you.” Ms. Zhang said that although she was a little skeptical about it, she still forwarded the message to several friends. Zhang Mingying, a senior engineer at the Municipal Meteorological Bureau, told reporters that there are obvious flaws in the claim that volcanic ash erupted in Iceland and caused acid rain in Beijing. First, there must be atmospheric circulation to bring volcanic ash to my country or the Beijing area. Monitoring from the China Meteorological Administration shows that the Icelandic volcanic eruption was so powerful and had a wide impact that it affected almost the entire European aviation industry. However, its core area of ​​impact was the neighboring Nordic region. So far, the monitoring and reports of meteorological departments in various European countries have None showed strong acid rain. From common sense analysis, the transmission distance of sulfur dioxide is very limited. After thousands of kilometers of high-altitude transmission, the impact on China is very limited. However, Beijing’s relatively low latitude is even less likely to have an impact. Secondly, the process of sulfide diffusion Subsidence will occur in the volcano. Not only precipitation will release this acidic substance, even the dust falling from the sky also contains acidic substances. If the volcanic ash in Iceland spreads to our country, the sulfide will be greatly reduced due to the sedimentation effect, causing the possibility of acid rain. It won't be very big either. There is no scientific basis for the fact that Icelandic volcanic ash spread across the Internet can cause "acid rain once in 750 years" in my country. "Where does a time definition like 750 years come from?" Zhang Mingying told reporters that humankind's understanding of weather conditions, including acid rain, has been a step-by-step process, although predecessors have more or less recorded past weather phenomena. , but there is absolutely no record of 750 years. It will take less than a hundred years to truly have a deep understanding of weather phenomena. The concept of 750 years can only be spread on the Internet. Yesterday (April 22), Beijing did receive moderate rain. The largest rainfall in the city reached about 15 millimeters, while the city's average rainfall was 10 millimeters. Such spring rain is undoubtedly a welcome rain for Beijing, which has been suffering from drought. But the "label" of being called "acid rain" is too "unjust" because of the good rain that nourishes Beijing. Zhang Mingying said that in order to monitor acid rain, Beijing has set up an acid rain observation station at the southern suburbs observatory. Yesterday's monitoring data showed that the pH value of rain was 6.23, which is close to normal. The definition of acid rain is: acid precipitation that is polluted by acidic gases in the atmosphere and has a pH value of less than 5.65 is called acid rain. Obviously, monitoring data is the most authoritative, and the "acid rain once in 750 years" is self-defeating in the face of this data.