Although mostly invisible to the naked eye, the air we breathe is full of tiny particles of; viruses, bacteria, mould, soot, chemicals, soil, smoke, dust or allergens, in the form of liquids, gases or solids.

Fossil fuel burning releases gases and chemicals and is air pollution, posing a risk to human health and the planet as a whole.

These minuscule airborne hazards are referred to as particulate matter, or PM.

Why is it called 2.5?

The 2.5 in PM2.5 refers to the size of the pollutant in micrometers. Bear with us here while it gets a bit mathematics-y!

Micrometers have this symbol: µm and are equivalent to 0.001 millimetres.

The smallest thing that the average human eye can perceive is about 0.1 millimetres, which is around the same width as a human hair. So in order for us to see something as incredibly small as a micrometer, we need to use powerful microscopes.

The diagram below from the Environmental Protection Agency will help you visualise the scale of these tiny particles.

Application and usage of the PM2.5 mask filter

PM2.5 activated carbon mask filter is inserted in a cotton cloth mask like the one sold here, to block air pollution particles, some known coronavirus family viruses like flu, and other tiny particles, floating in the air, from entering our bodies which can cause:

• shortness of breath
• eye, nose and throat irritation
• excessive coughing and wheezing
• diminished lung function and lung disease
• diminished heart function, sometimes resulting in heart attack
• asthma attacks
• death

Features of the PM2.5 mask filter

• Material: 5-layer of Non-woven fabric + melt-blown fabric + activated carbon fabric + melt-blown fabric + non-woven fabric
• Packing: 2pcs/opp bag, 2500 pcs/ctn
• Weight: 2g
• Certificate: CE, FDA, ISO: 13485, ISO: 9001