Noise Contour Map Guidelines and Signage Requirements

“According to the 2018 announcement by the Department of Labor Protection and Welfare, specific guidelines have been established for noise contour maps and warning signs in areas where noise levels exceed 85 dBA. These regulations outline the format and dimensions for noise contour maps, noise level indicators, hazard warning signs, and personal protective equipment (PPE) requirement signs. The key components are as follows:”

1. Noise Contour Map Format and Dimensions

The noise contour map serves to inform individuals entering an area about varying noise levels, guiding them to use appropriate hearing protection. The map design must adhere to these specifications:

1.1 Character spacing must not vary by more than 10% across the entire text.

1.2 Font style should be simple, without shadows or decorative elements.

1.3 Character height must be at least 20 mm, with width no less than 70% of the height.

1.4 Text may be in multiple languages (e.g., English, Burmese, Lao, Cambodian) but must include Thai.

1.5 The map must be clearly visible under all lighting conditions.

2. Noise Level and Hazard Warning Sign Format

These signs must include:

2.1 Components: Safety alert symbol, signal word, safety symbol, hazard area description, noise level display, and protective measures.

2.2 Character spacing consistency as per map guidelines.

2.3 Simple font style without embellishments.

2.4 Signal word and noise level characters must be at least 60 mm high; general text at least 20 mm high.

2.5 Symbols and text may be adapted but must convey the same safety message.

2.6 Multilingual text is permitted with Thai always present.

2.7 Signs must be clearly visible in all lighting conditions.

3. Personal Protective Equipment (PPE) Warning Sign Format

PPE warning signs must comply with the following:

3.1 Blue background covering at least 50% of the sign.

3.2 Consistent character spacing.

3.3 Simple, unadorned font.

3.4 Character width at least 70% of height.

3.5 Sign width at least 70% of height.

3.6 Symbols and text may vary but must clearly indicate hearing protection requirements.

3.7 Multilingual text permitted with Thai always included.

3.8 Signs must be clearly visible under all lighting conditions.