Summary: A number of air purification vehicles, such as “cleaning up to 99 per cent” and “indoor 20 minutes” earlier, were often unworkable. As of today, the New National Signs for Air Netors have been officially implemented, and there is a clear reference for citizens to purchase air purification devices. It is often remarkable that some air purification devices put out “a clean-up rate of 99 per cent”, “indoor 20 minutes” earlier. As of today, the New National Signs for Air Netors have been...