Fig. 1. Temporal variations of PM_2.5 and PM₁₀ mass concentrations and PM_2.5/PM₁₀ ratio in the near-surface atmosphere of Taixing City from March 29 to 31, 2021

Fig. 2. Lidar observations in Taixing City from March 29 to 31, 2021. (a) The extinction coefficient; (b) the depolarization ratio

Fig. 3. 48 h backward trajectory of air mass. (a) 11:00, March 29, 2021; (b) 08:00, March 30, 2021; (c) 18,:00, March 30, 2021

Fig. 4. Temporal variations of near-surface wind speed and direction in Taixing City from March 29 to 31, 2021

Fig. 5. Temporal variations of near-surface air humidity and dew temperature in Taixing City from March 29 to 31, 2021

Fig. 6. Temporal variations of PM_2.5 and PM₁₀ mass concentrations and PM_2.5/PM₁₀ ratio in the near-surface atmosphere of Taixing City from May 7 to 9, 2021

Fig. 7. Lidar observations in Taixing City from May 7 to 9, 2021. (a) Extinction coefficient; (b) depolarization ratio

Fig. 8. 48 h backward trajectory of air mass. (a) 18:00, May 7, 2021; (b) 03:00, May 8, 2021; (c) 12:00, May 8, 2021

Fig. 9. Temporal variations of near-surface wind speed and direction in Taixing City from May 7 to 9, 2021

Fig. 10. Temporal variations of near-surface air humidity and dew temperature in Taixing City from May 7 to 9, 2021