The results indicate that although the manufacturers’ published
figures for the air pollution removal efficiency of their air purifiers
have always been in the range of 80–99%, the actual performance
of the products is not as good as they claim. Because the market
for air purifiers is booming, the manufacturers may exaggerate the
capability and in doing so, mislead consumers. There is therefore
a need for the relevant government departments to push forward
the development of standards for air purifiers