What materials are acceptable for "No Smoking" signs in outdoor conditions?

The acceptable materials for "No Smoking" signs in outdoor conditions must be durable and resistant to various environmental factors, which is why water-resistant metal or other durable materials are the correct choice. These materials can withstand exposure to moisture, wind, sunlight, and other weather-related conditions without deteriorating, fading, or becoming illegible over time.

Using water-resistant metal ensures that the signs remain visible and informative, thereby effectively communicating the "No Smoking" policy in outdoor settings, which is essential for safety and compliance at construction sites. Other materials, like paper or wooden signs, may not provide the necessary durability or resistance to the elements, leading to issues with visibility and effectiveness in conveying important safety information.