To their credit, Reading continued to look for a way back into the match after the home side went 3-0 up, Laurent Koscielny needed to make a last-ditch tackle on Pogrebnyak.
Arsenal switched off, which allowed Reading to pull a goal back as Jobi McAnuff floated cross from the left was headed in at the far post by Robson-Kanu with full back Nacho Monreal clattering into the woodwork,
More top news
Tuesday's weather for the west of the region
Tuesday's weather for the east of the region
Monday evening's weather for the west of the region