1。 Carbon dioxide should be less than 0. 1%. Carbon dioxide is a comprehensive indirect index to judge indoor air. If the concentration increases, children may feel nausea and headache.

2。 Carbon monoxide should be less than 5mg/m3. Carbon monoxide is the most common toxic gas in indoor air, which easily damages children's nerve cells and is extremely harmful to their growth.

3。 The total number of bacteria should be less than 10 /m3. The child is in the stage of growth and development, and his immunity is relatively low. It is necessary to sterilize the room.

4。 The indoor air temperature should be between 18℃ and 28℃. The child's thermoregulation ability is poor, and it should be controlled below 28℃ in summer and above 18℃ in winter. However, we should pay attention to the influence of air conditioning on children's health and use it reasonably.

5。 Indoor relative humidity should be kept between 40% and 65%. The humidity is too low, which is easy to cause respiratory damage to children; Excessive humidity is not conducive to sweat evaporation, making children unwell.

6。 The speed of indoor air flow should be appropriate. Under the premise of ensuring indoor ventilation, the air volume should not be greater than 0.3m/s, which will make children feel cold.

7。 Indoor lighting should be suitable. When children are reading and writing, the indoor light should be evenly distributed without strong glare, and the desktop illumination should not be lower than 100LX.

8。 Indoor noise should be controlled below 50 decibels. Noise has a great influence on children's brain activities: on the one hand, it distracts children's attention in learning activities; On the other hand, prolonged exposure to noise will cause children's psychological stress and affect their physical and mental health.