Removal efficiency of PM2.5 and PM10 by four types of masks

6. Acknowledgement

The author would like to thank Dr. Han Huy-Dung for lending the PMS7003 sensors. Two friends suggested that the author should test air masks and for that additional push tipped the balance, for that the author thanks them for the extra tick. Last but not least, the author would like to thank his wife (H.N) for willingly gave up two-used air masks and switched to a brand name respirator. She also gave up a large portion of the balcony to host the equipment and forgave the author not doing a day job in order to follow his priority, for that, the author thanks her for her consideration.