Windy offers already the Aerosol layer which is based on light reduction by particles in the air (see Air Quality layers). It is expressed as Aerosol Optical Depth (AOD) at 550 nm.
See more details by clicking the small circled i.
@korina Right, it does. But I hope you see why it would be more convenient to have that in map form as well. (Just like Wind speed and direction are also in the detailed forecast, but its nicely animated map view is still a useful feature)
@el_kl the other thought is that when you linked the canadian radars this past year Environment Canada was in the process of switching all of their links over to a new mapping system and for some reason the radar coverage for Sudbury/North Bay area might have been missing at that time. It seems there is a now a full complement of radar coverage across Canada now. There is one radar site along the western Quebec border (Rouyn/Val D'Or ) site that never became visible with the new Canadian web mapping service.