Advances in Meteorology

Research Article

Study on the Precursor Signal Capturing of Unfavorable Weather: Months/Years in Advance to Ultra-Early Forecast for Hourly Transient Weather Changes during the Beijing Winter Olympics

Table 3

Weather phenomena and atmospheric aerosol elements of the pollution process in Beijing for February 2017 and 2021.
Pollution processes in Beijing for Feb 2017VisibilityWeather: haze
① 01:00 3 Feb to 21:00 05 Feb① Vis_mini. = 1.0 km√
② 19:00 15 Feb to 07:00 17 Feb② Vis_mini. = 1.1 km√
③ 08:00 19 Feb to 07:00 20 Feb③ Vis_mini. = 2.2 km√
④ 05:00 27 Feb to 22:00 28 Feb④ Vis_mini. = 2.1 km√
Pollution processes in Beijing for Feb 2017Factor of aerosols and PLAM 
① 18:00 04 Feb to 22:00 04 Feb① PM2.5 = 351 μg/m3 
NO2 = 169 μg/m3, O3↑102 μg/m3 
PLAM = 182 
② 07:00 15 Feb to 19:00 16 Feb② PM2.5 = 275 μg/m3 
PLAM = 183, S = 3.2% 
③ 13:00 20 Feb to 00:00 23 Feb③ PM2.5 = 176 μg/m3 
PLAM = 190, S = 3.2% 
④ 05:00 27 Feb to 22:00 28 Feb④ PM2.5 = 98 μg/m3 
O 3 = 97 μg/m3 
NO2 = 121 μg/m3 
Pollution processes in Beijing for Feb 2021VisibilityWeather: haze
① 06:00 11 Feb to 19:00 15 Feb① Vis_mini. = 1.3 km√
② 06:00 26 Feb to 00:00 28 Feb② Vis_mini. = 1.1 km√
Pollution processes in Beijing for Feb 2021Factor of aerosols and PLAM 
① 06:00 11 Feb to 19:00 15 Feb① PM2.5 = 472 μg/m3 
NO2 = 106 μg/m3, O3↑117 μg/m3 
PLAM = 190 
② 06:00 26 Feb to 00:00 28 Feb② PM2.5 = 198 μg/m3 
PLAM = 185, S = 5.7% 
O 3 = 113 μg/m3