On 27 June, several fires occurred in the northwestern area of the capital. The greatest fire started at 11.30 UT (13.30 LT). At first brushwood burned, but then, due to the wind and the high temperatures, it quickly expanded affecting a large area, including fields, campers with gas cylinders, and some houses and producing a high column of smoke shown in the images. The plume has reached different areas of the city, covering the sky for several km also thanks to wind blowing from southwest, as shown by Hysplit forward trajectories (panel A, from 500 to 1000 meters) starting from the area affected by the fire. This event was observed through the eyes at the BAQUNIN supersite. The last picture shows the instruments installed in the APL site and, on the back, the plume reaching the site only 2 hours after the fire beginning (15.34 LT, 13.34 UT).  BAQUNIN remote sensing instruments detect an increase in the aerosol optical thickness (Cimel – AERONET data, panel B), and in the content of NO2 and formaldehyde (HCOH) obtained from westward Pandora sky measurements (azimuth of 230 and 300 degrees, orange and red curves in the C and D panels, respectively). The in-situ air quality station records an increase in PM1, PM2.5 and PM10 concentrations starting from 15.30 UT, as shown in panel E.