What is the current EPA standard for clearance dust on floors in lead paint testing?

What is the current EPA standard for clearance dust on floors in lead paint testing?

• A. 250 ug/ft2
• B. 40 ug/ft2
• C. 400 ug/ft2
• D. 4000 ug/ft2

Answer: (B)

The key idea is that clearance testing sets specific dust-lead limits for different surfaces, and floors have their own threshold. For floors, the allowable level of lead dust is 40 micrograms per square foot. This value is determined through wipe sampling of defined floor areas and lab analysis; the average of the floor wipe samples must meet or be below 40 µg/ft2 to pass clearance. The other numbers correspond to different surfaces or contexts (for example, window sills have a different, higher threshold) and aren’t the floor standard.

The key idea is that clearance testing sets specific dust-lead limits for different surfaces, and floors have their own threshold. For floors, the allowable level of lead dust is 40 micrograms per square foot. This value is determined through wipe sampling of defined floor areas and lab analysis; the average of the floor wipe samples must meet or be below 40 µg/ft2 to pass clearance. The other numbers correspond to different surfaces or contexts (for example, window sills have a different, higher threshold) and aren’t the floor standard.