Which environmental parameters are key for art storage and display, and what are typical ranges for paintings and works on paper?

• A. Temperature, relative humidity, light exposure, pollutants, and vibration; paintings 18-22°C, 40-50% RH; works on paper 40-50% RH, light under 50-100 lux
• B. Lighting at noon only
• C. Temperature above 30°C and humidity above 70%
• D. No limits on light or humidity

Answer: (A)

Control of environmental factors is vital for storage and display, because small changes in temperature, humidity, light, and air quality accumulate over time and drive the aging and damage of artworks. The essential factors are temperature, relative humidity, light exposure, pollutants, and vibration. Keeping paintings around 18-22°C with 40-50% relative humidity helps minimize moisture-related swelling, cracking, and pigment interactions. Works on paper are especially sensitive to humidity and light, so a similar 40-50% RH paired with low light levels (often under 50-100 lux) slows fading, yellowing, and fiber deterioration. Pollutants and vibration are also kept low to reduce chemical attack and physical wear. The other options don’t provide a balanced, protective approach: lighting only at noon misses consistent, controlled exposure; excessive heat and humidity create rapid deterioration; and having no limits on light or humidity would allow ongoing damage.