Yes. An air purifier that uses both HEPA filtering for fine particles and a pre-filter for larger particles might be your best defence against dangerous smoke levels in the home. HEPA filters can catch particles as small as 0.3 micrometres with 99.97% efficiency, which covers most airborne toxins and allergens. They will do a reasonable job of catching larger nasties too. However, for the most efficient filtering of smoke particles (measuring at 2.5 micrometres or PM2.5), a combination of HEPA and pre-filtering is most efficient. For example, the Philips and Samsung range of purifiers use an Active Carbon pre-filter that can catch gases and other TVOCS (Total Volatile Organic Compounds). Some air purifiers (such as Samsung's AX5500 Air Purifier), are even specifically designed to give you a PM2.5 readout so you can tell exactly how much smoke’s managed to creep its way into your house. Air purifiers are not a panacea for all your air pollutant problems and for people living with allergies or respiratory conditions like asthma, the 0.03% of particles that slip through can do some damage. Read on for more tips on keeping your house allergen and smoke-free.