Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Filtering efficiency of N95 FFRs against PM2.5.
| S. N. | N95 FFRs | Without filtration (μg/m3) | With filtration (μg/m3) | TIL (%) | Efficiency (%) |
|---|---|---|---|---|---|
| 1. | N95 (i) | 49 ± 3.74 | 15.1 ± 2.15 | 31 | 69 |
| 2. | N95 (ii) | 5.62 ± 0.78 | 1.8 ± 0.7 | 32 | 68 |
| 3. | N95 (iii) | 138.1 ± 22 | 36.75 ± 20.43 | 27 | 73 |
| 4. | NIOSH respirator | 122.1 ± 20.85 | 38.41 ± 14.59 | 31 | 69 |
