<https://smartairfilters.com/zh/blog/are-japanese-pitta-masks-effective-for-use-in-china/>
<http://schema.org/description>
"Pitta masks capture large pollen particles, but they are ineffective against 0.3-micron particles, so PM2.5, bacteria and virus cannot be captured."
<https://smartairfilters.com/zh/blog/are-japanese-pitta-masks-effective-for-use-in-china/>