久久亚洲国产成人影院-久久亚洲国产的中文-久久亚洲国产高清-久久亚洲国产精品-亚洲图片偷拍自拍-亚洲图色视频

Global EditionASIA 中文雙語(yǔ)Fran?ais
China
Home / China / Environment

Pollen concentrations in Beijing to remain airborne through spring

By LI HONGYANG | China Daily | Updated: 2023-04-29 10:58
Share
Share - WeChat
Pedestrians travel amid floating pollen and willow catkins near the Palace Museum in Beijing on April 15, 2023. [Photo/VCG]

Monitoring data from a WeChat applet called 'pollen monitoring forecast' by the Beijing Meteorological Service and Beijing Tongren Hospital showed that pollen concentrations in the city's air will remain high between March and May — as much as 1,600 grains per 1,000 square millimeters per day.

One of the reports on the applet said that during the period, the density of pollen in the air was around 400 grains.

When the grain count is higher than 100, it means that people allergic to pollen should protect themselves, according to the China Meteorological Administration.

The report also showed that in Beijing, airborne pollen affects residents from August to October as well, though levels are lower than in spring.

In spring, pollen comes mainly from trees including cypress, pine, willow, birch and elm while in autumn, it is from herbaceous plants such as grass, artemisia and hop vines.

In addition to Beijing, the applet reports pollen allergen data and periods of high airborne concentration for another 31 cities.

Pollen observation relies on manual work. Forecasters first collect and distinguish pollen from dust and sand, then classify particles according to their characteristics. They then produce pollen forecasts by combining this data with real-time weather development trends, especially temperature and wind speed, according to the CMA.

Meteorological conditions exert great influence on pollen transmission by air, the CMA said.

When it is sunny with dry and mild wind and a maximum temperature between 15 and 25 C, it is most conducive to the spread of pollen.

When there is moderate to high rainfall and stronger wind with a maximum temperature below 5 C, it is less likely for people to have allergic reactions.

From March to April, the pollen allergy meteorological data of 30 provincial-level administrative regions in the country reached level 4, meaning pollen concentrations between 301 and 500 grains per 1,000 square millimeters, according to the CMA.

The CMA suggested that those who are sensitive should choose places with less pollen as a travel destination, such as the seaside. On light rainy days or after rain, the pollen concentration is relatively low, which is suitable for traveling.

Wearing a mask or goggles can reduce the chance of pollen irritation.

Immediately after returning home, people should change into clean clothes and wash their hands and face to reduce the chance of pollen remaining on the body.

In addition, they should eat more vitamin-rich foods to improve immunity.

Top
BACK TO THE TOP
English
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
 
主站蜘蛛池模板: 国产欧美日韩综合二区三区 | 国产成人精品日本亚洲网址 | 精品久久一区二区三区 | 亚洲国产欧美目韩成人综合 | 黄色作爱| 中文毛片 | 亚洲免费一级片 | 91精品国产91久久久久青草 | 国产精品无码久久久久 | 精品九九久久 | 欧美高清不卡 | 久久国产精品免费视频 | 久久免费视频观看 | 三级全黄的视频 | 99久久九九 | 女女同性一区二区三区四区 | 成人欧美一级毛片免费观看 | 日韩欧美中文字幕在线播放 | 成年女人毛片免费观看中文w | 91精品欧美一区二区综合在线 | 精品午夜久久网成年网 | 国产精品19禁在线观看2021 | 成人国产一区二区三区 | 手机看片免费基地你懂的 | 亚洲高清国产一区二区三区 | 长腿嫩模打开双腿呻吟 | 欧美一区二区在线视频 | 国产精品三级国语在线看 | 欧美激情视频一级视频一级毛片 | 欧美黄视频 | 欧美成人h精品网站 | 一级做a爱过程免费观看 | 成人午夜天 | 欧美一区二区三区gg高清影视 | 久久久久久综合对白国产 | 久久精品国内偷自一区 | 亚洲国产中文字幕 | 毛片免费在线观看 | 久久一区二区三区不卡 | 毛片网站在线看 | 成人在线免费视频播放 |