Update 90_workshops/202203_apn_airpollution_training/.gitkeep,...

Update 90_workshops/202203_apn_airpollution_training/.gitkeep, 90_workshops/202203_apn_airpollution_training/day_1/09_CAMS_global_reanalysis_pm2pt5_timeseries.ipynb, 90_workshops/202203_apn_airpollution_training/day_1/03_Metop-A_GOME-2_NO2Tropo_L2_load_browse.ipynb, 90_workshops/202203_apn_airpollution_training/day_1/06_produce_gridded_Metop-AB_GOME-2_NO2Tropo_L2.ipynb, 90_workshops/202203_apn_airpollution_training/day_1/07_time-series_Metop-AB_GOME-2_NO2Tropo_L2.ipynb, 90_workshops/202203_apn_airpollution_training/day_1/02_Sentinel-5P_TROPOMI_NO2_L2_load_browse.ipynb, 90_workshops/202203_apn_airpollution_training/day_1/05_anomaly-map_Metop-AB_GOME-2_NO2Tropo_L2.ipynb, 90_workshops/202203_apn_airpollution_training/day_1/08_CAMS_global_forecast_pm2p5_load_browse.ipynb, 90_workshops/202203_apn_airpollution_training/day_1/04_Metop-AB_GOME-2_NO2Tropo_L2_preprocess.ipynb, 90_workshops/202203_apn_airpollution_training/day_1/01_OMI_NO2_L2.ipynb