Table 3.

BC concentrations at 375 nm and 880 nm and their filtration efficiency for both wavelengths.

Filter	BC concentration (ng m−3)		Global Filtration Efficiency (%)
	375 nm	880 nm	375 nm	880 nm
1	1051.79	950.53	90.34		74.53
2	831.53	721.14	91.65		65.35
3	577.35	453.07	76.93		53.85
Average	820.23	708.25	86.31		64.58
Standard Error	137.08	143.75	4.70		5.98