Index	Temp≥	Temp≤	Hum≥	Hum≤	Light≥	Light≤	Noise	HCHO	CO₂
Index	˚C	˚C	%	%	lx	lx	dB	mg/m³	mg/m³
I	20	24	40	60	300	500	45	0.04	1200
II	18	26	35	65	250	550	50	0.07	1600
III	16	28	30	70	200	600	55	0.10	2000
IV	14	30	25	75	150	650	60	0.20	2400