Humidity refers to the amount of water vapor in the air. Absolute humidity measures actual water vapor in grams per cubic meter. Relative humidity compares current moisture to maximum capacity at given temperature
A humidifier increases moisture in the air by releasing water as mist. It differs from dehumidifiers, which remove moisture from the air. Most comfortable indoor humidity is 45 percent
CO2 is a naturally occurring gas in atmosphere, essential for photosynthesis. Global CO2 levels are highest in almost three million years. Humans have increased atmospheric CO2 by about 100 ppm in past five decades
GUV uses UV energy to kill viral, bacterial, and fungal organisms in workplace. Best used as part of layered approach with ventilation systems. Most effective in group settings like offices and schools
Immediate effects include eye, nose, throat irritation and headaches. Long-term effects may cause respiratory diseases and cancer. Symptoms can appear years after exposure. Individual sensitivity varies greatly to pollutants
PM2.5 refers to particles less than 2.5 micrometers in diameter. These particles can penetrate deeply into lungs unlike larger PM10. Natural sources include wildfires and volcanic eruptions