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The term "basement humidity level" refers to the moisture content of the air in a basement. A humidity level above 80 percent encourages mold and mildew development, according to Basement Health Pros. The ideal humidity ... More »

The way to prevent humidity in a basement is to identify the cause of humidity and manage it. Typical sources of humidity include inadequate grading around the house, missing gutters and ineffective window design. More »

The ideal humidity for a basement, finished or unfinished, is at or below 50 percent relative humidity. Relative humidity is the percentage of water vapor in the air as compared to the maximum amount it can hold. At 50 p... More »

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The actual humidity in terms of the water content of air is typically expressed as grams per kilogram or kilogram per kilogram. Humidity is typically expressed as a percentage of how humid it could physically be at a giv... More »

A humidity level of about 45 percent is considered comfortable outdoors. Levels of humidity can vary from place to place. Humidity levels change according to seasons. Winters are dry and humidity is high in the summer. More »

People are most comfortable whenever the relative humidity level is around 45 percent says HowStuffWorks. A level of 100 percent humidity means that the air is saturated with water vapor and unable to hold more. When thi... More »

Forty-five percent relative humidity is the comfortable relative humidity level. Below 30 percent humidity, the air feels dry, and above 52 percent relative humidity, the air feels very moist. More »