In the morning, the weather is dusty and the citizens question whether they can run in the morning Xi'an Environmental Protection Bureau: the main ingredient is fog

"What's going on with the weather?" I think the pollution is very heavy, but the data is good, dare to run? Yesterday, Ms. Li, a 33-year-old citizen of Xi'an, said that she had been a little confused recently.

Ms. Li said that she has the habit of running in the morning, and the sky is always gray these days, but from the official air quality index, it is not pollution.

The sky in Xi'an yesterday was also gray. At 17:30, the Huashang Daily reporter saw in the Shaanxi Provincial Air Quality Real-time Release System on the official website of the Xi'an Municipal Environmental Protection Bureau that from 17:00 on October 15 to nearly 13:00 yesterday, the Xi'an air quality index (aqi) was between 60 and 100, which was good; after 13:00, aqi rose to 110, until 16:00, it was still above 100, which was mild pollution, and the primary pollutant was pm2.5.

In this regard, Jiang Nan, senior engineer of the Xi'an Iron Fist Haze Control Office, said that these days Xi'an morning is gray, more components are fog, after the cold dew, the night temperature is low, the morning water vapor condensation, easy to fog. In addition, after the pm2.5 particles in the air encounter water vapor, the volume increases, the vertical direction diffusion is inhibited, after noon, if it encounters a cloudy day, the ground cannot be heated, the vertical direction diffusion is still inhibited, plus there is no wind, the lateral diffusion conditions are not good, so it leads to mild pollution. "The 16th is a cloudy day, if it is a sunny day, the sun shines in the afternoon, the ground temperature rises, the height of the mixed layer rises, just like the 'pot lid' is uncovered, the particles can spread vertically, and the sky will not be gray." (Huashang Daily reporter Ren Ting)

Editor: Don Babe