China News Service, Beijing, November 18 (Reporter Chen Hang) The reporter learned from the Beijing Municipal Meteorological Department that there will be a strong cold air affecting Beijing from the 21st to the 22nd, which will bring strong winds to cool down the weather.

  The Beijing Municipal Ecological and Environmental Monitoring Center stated that on the 21st, the ground turned strong from northwestern cold to northwest wind, and the diffusion conditions were improved. The air quality is expected to be better.

  Pay attention to wind and cold when you go out on Sunday

  The Meteorological Department said that the wind-cold effect in Beijing is expected to be obvious on the 21st, and pay attention to wind and cold when going out on Sunday; the temperature dropped to the lowest point on the 22nd, with the highest temperature during the day being around 4℃ and the lowest temperature at night -4℃.

  The Meteorological Department reminds the public to pay attention to the nowcast warning information in time and arrange travel plans reasonably according to weather changes.

  Air quality is expected to become better on the 21st

  According to the Beijing Municipal Ecological Environment Monitoring Center, Beijing is expected to be controlled by low pressure at night on the 18th, with southerly winds, and unfavorable conditions for diffusion. In addition to the large-scale transmission of regional pollution to the southeast, Beijing’s air quality at night is expected to be level 4 moderate. Pollution level, some areas can reach severe pollution levels in certain periods.

  In addition, Beijing was affected by the northeast high pressure on the 19th, and the ground was northeasterly wind, and the diffusion conditions were improved. The air quality is expected to be good to mild at 2 to 3 levels; on the 20th, the ground will turn to the equalizing field, and it is expected that pollution will return, and the air quality is expected. It is a level 3 mild pollution; on the 21st, the ground turned strong from northwestern cold to northwest wind, and the diffusion conditions improved. The air quality is expected to turn to good.

  Air pollution levels rose significantly on the 18th

  The official Weibo report of the Beijing Municipal Ecological Environment Monitoring Center stated that in the middle of the night before the 17th, Beijing was controlled by the low-pressure convergence zone, with unfavorable diffusion conditions and accumulation of pollution. At the same time, air pollution levels in Beijing increased due to the impact of pollution transmission from the southwest to the surrounding areas. Reached level 3 light pollution.

  From the early morning to the morning of the 18th, due to the weak high pressure in the direction of Zhangjiakou in the northwest, the whole area of ​​Beijing was basically affected by the weak northerly wind. The diffusion conditions have improved, the air pollution level has dropped, and the PM2.5 hourly concentration has dropped to 60-70. About micrograms/cubic meter, a good level of 2.

  Starting at noon on the 18th, the weak high pressure in the northwest has weakened and receded westward. Beijing is gradually affected by the low-pressure convergence system. The humidity is relatively high, the wind is small, and the diffusion conditions have deteriorated significantly. Concentration pollution transmission has intensified, and the hourly PM2.5 concentration in Beijing has risen rapidly. The PM2.5 concentration exceeded 115 micrograms/m3 at 13:00, and exceeded 120 micrograms/m3 from 14:00 to 15:00, reaching a moderate pollution level, and some sites reached medium levels. Heavy pollution.

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