Multilevel RNN-Based PM10 Air Quality Prediction for Industrial Internet of Things Applications in Cleanroom Environment

Table 3

Class differentiation of ISO.

ISO classification number ()	≥0.1 μm	≥0.2 μm	≥0.3 μm	≥0.5 μm	≥1 μm	≥5 μm
ISO class 1	10	2
ISO class 2	100	24	10	4
ISO class 3	1000	237	102	35	8
ISO class 4	10000	2370	1020	352	83
ISO class 5	100000	23700	10200	3520	832	29
ISO class 6		237000	102000	35200	8320	293
ISO class 7				352000	83200	2930
ISO class 8				3520000	832000	29300
ISO class 9				35200000	8320000	293000