The quality of air in indoors is indicated by:
A. Temperature

B. Illuminance

C. Humidity

D. Rate of air movement

E. Radiant heat
Choose the correct answer from the options given below:

Correct option is C

· A. Temperature: The temperature of the indoor environment is crucial to air quality. Too high or too low a temperature can negatively affect comfort and air circulation.
· C. Humidity: Humidity levels are a significant indicator of air quality. Low humidity can cause dryness in the air, while high humidity can lead to mold and dust mites, making the air feel "stuffy."
· D. Rate of air movement: The rate of air movement (ventilation) affects indoor air quality by ensuring that fresh air circulates and removes pollutants or contaminants from the space.
· E. Radiant heat: Radiant heat also plays a role in indoor air quality by affecting the temperature and comfort level within the room. It can impact how comfortable people feel, which in turn affects their perception of air quality.
Information Booster:
· Temperature (A): Indoor air quality is impacted by the ambient temperature. Extreme temperatures can lead to discomfort, reduced air circulation, and an overall negative perception of the indoor environment. The ideal temperature for indoor comfort is typically between 18°C and 22°C.
· Humidity (C): Humidity refers to the amount of moisture in the air. Inadequate humidity levels can cause dry skin, respiratory discomfort, and eye irritation. High humidity levels can promote the growth of mold and dust mites, leading to poor air quality and health concerns. The recommended humidity range for indoor air is 30-60%.
· Rate of Air Movement (D): The air movement or ventilation rate is crucial for removing pollutants, such as carbon dioxide, volatile organic compounds (VOCs), and other indoor air contaminants. Proper ventilation is key to ensuring a fresh indoor environment with a constant supply of fresh air.
· Radiant Heat (E): Radiant heat refers to the heat emitted by objects in a room, like radiators or sunlight coming through windows. If poorly managed, it can create hot spots, affecting comfort and thus indoor air quality. Radiant heat influences the perception of air quality, contributing to overall thermal comfort.
Additional Knowledge (Incorrect Option):
· B. Illuminance: Illuminance refers to the amount of light in an area, measured in lux or foot-candles. While lighting can affect comfort and productivity, it does not directly influence indoor air quality. Therefore, it is not an indicator of air quality.