PM stands for particulate matter (also called particle pollution): the term for a mixture of solid particles and liquid droplets found in the air. Some particles, such as dust, dirt, soot or smoke, are large or dark enough to be seen with the naked eye. Others are so small that they can be detected only using an electron microscope.
Particle pollution includes:
- PM10 : inhalable particles with diameters generally 10 micrometers and smaller; and
- PM2.5 : fine inhalable particles with diameters generally 2.5 micrometers and smaller.
- How small is 2.5 micrometers? Think about a single hair from your head. The average human hair is about 70 micrometers in diameter – making it 30 times larger than the largest fine particle.
Beside PM 10 and PM 2.5, there are even smaller particulate matters which are no often mentioned. Despite they are less known they are no less dangerous.
Particulate matter contains microscopic solids or liquid droplets that are so small that they can be inhaled and cause serious health problems. Some particles less than 10 micrometers in diameter can get deep into your lungs and some may even get into your bloodstream. These, particles – less than 2.5 micrometers in diameter or even smaller – also known as fine particles or PM2.5 , pose the greatest risk to our health.
We are measuring the degree of pollution with particul matters in different areas of western Slovenija and Italy. Measuring palces could be either powered by electricity or be autonomous. Frequency of measurement could be up to 1 measurement per minute, but we can get a precise picture of poluttion with 10 minute measurement every .
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