Hi, ER reported 4 stars air quality and I run my Dyson air purifier PH04 with full performance to purify my air but ER after 1h report still 4 stars and Dyson reported Good AQ(good is max) - 0-3ug/m3 PM2.5, 0-3ug/m3 PM10, Formaldehyd 0.009mg/m3, also in EVE app - surprisingly level is only worse of VOC.
Aug 23, 2023