What is the maximum visible opacity allowed for fugitive dust emissions?

• A. 10%
• B. 20%
• C. 30%
• D. 40%

Answer: (B)

The correct answer is based on regulations that specify limits for fugitive dust emissions to control air pollution effectively. In many jurisdictions, the maximum allowable visible opacity for fugitive dust emissions is indeed set at 20%. This standard is established to ensure that emissions do not significantly impede visibility or contribute excessively to air quality degradation.

Opacity is a measure of how much light is obscured by particles in the air, and a limit of 20% means that only a small percentage of light can be blocked by dust emissions. This regulation aims to minimize the impact on health, the environment, and overall air quality, thereby protecting public welfare and maintaining a healthier atmosphere.

Understanding this allows individuals and organizations involved in dust-generating operations to implement appropriate control measures and maintain compliance with environmental standards.