What is PM 2.5?
Particulate matter (PM), a key component of air pollution, refers to a mixture of solid and liquid particles in the air. Micro pollutants that have a diameter of less than 2.5 micrometers are referred to as PM 2.5. If you’re wondering how small that is, just imagine this: the diameter of a strand of your hair is about 30 times wider than that of the largest fine particle!
Where do these pesky micro pollutants come from? Common sources of air pollution include vehicles that run on either diesel or petrol, power plants and fires. Unfortunately, staying indoors does not mean that you won’t be exposed to air pollution: smoking (including second-hand smoke!), open fires, gas stoves and even paints and household cleaning products can contribute to indoor air pollution.