For all of you in western Canada and US who are suffering thru smoke inhalation ,I have heard it is like smoking 40 plus cigarettes a day and do not have an air purifier or they are sold out every where her is a simple in expensive way to make one Go to you local hardware store etc where they furnace filters ,but a hepa one and install it in your furnace and turn the cirulating air on or if no Furnace buy a Hepa furnace filter and find a cardboaard box the same size and tape it into one end and then get your fan and put it at the other end,for best results have the fan well directed into the box,,ideally tape some cardboard around it so all the air gets pushed thru but MAKE sure you leave the back end of the fan fully open to suck the air ,It should make a big difference in a short while,I have a friend who is doing this on Vancouver island in Victoria ,Wish every one safety and health