Cleanroom noise standards are generally stricter than protective standards, with the aim of ensuring normal operation, meeting necessary conversation requirements, and providing a safe and comfortable working environment. Therefore, the primary indicators for measuring cleanroom noise are:

1. The Frustration Effect

Due to noise, which can cause unease and distress,烦恼 levels are generally categorized into seven: extremely quiet, very quiet, somewhat quiet, slightly noisy, quite noisy, and extremely noisy. Those with a reaction level indicating "quite noisy" or "extremely noisy" are considered to have high distress. The percentage of individuals with high distress in the total population is known as the high distress rate.

2. Impact on Work Efficiency

This primarily hinges on three levels of response: concentration, accuracy of movement, and work speed.

3. Interference with comprehensive communication

This is mainly divided into: Clear or Satisfied, Somewhat Difficult, Difficult, Impossible

The above three indicators are all evaluated using the A-weighted level. In the 1950s, it was proposed to use a frequency spectrum curve as the evaluation standard, which stipulated that the sound pressure level at the center frequency of each frequency band should not exceed this curve. Later, it was realized that using the A-grade to measure noise and the degree of interference and annoyance from noise with speech is more appropriate, and it can replace the octave band sound pressure level as an indicator for the evaluation standard.

We hold high standards. It is necessary to clarify the lighting method for windowless cleanrooms first:

(1) General Lighting

It refers to lighting installed to illuminate the entire area without considering special local requirements.

(2) Local Lighting

This refers to lighting set up to increase the illumination at a specific location (such as a work point). However, in indoor lighting, local lighting is generally not used alone.

(3) Mixed Lighting

This refers to the illumination on the work surface, which is a combination of general lighting and local lighting. According to the "Design Code for Clean Rooms," general lighting should account for 10% to 15% of the total illumination, but not less than 150LX. The luminous flux received per unit area of the illuminated space is the lighting unit lux (LX).

International Cleanroom Strength Requirements*, for instance, the United States has several standards for cleanroom requirements.

The artificial light of 300 lx is effective, and 500 lx is permissible when the workpiece is of higher precision. For areas requiring red light illumination, such as photolithography workshops in the electronics industry, the illuminance is generally between 25—50 lx.

Higher illumination levels are permissible when using natural light, which is beneficial for work. Therefore, it may be promising to use both artificial and natural lighting in cleanrooms in the future, as this is a trend emerging for energy-saving purposes.