What do air ppm mean?

Que signifie les ppm de l'air?

ppm, or "parts per million," is a unit of measurement used to express the concentration of a substance in air. When we speak of ppm in the context of air, we are generally referring to the quantity of a particular gas relative to one million parts of total air.

For example, if we say that the concentration of carbon dioxide (CO₂) in air is 400 ppm, this means that there are 400 molecules of CO₂ for every million molecules of air. This unit is often used to measure concentrations of various air pollutants or greenhouse gases.

PM2.5 refers to "airborne particles" with a diameter of less than 2.5 micrometers. These particles are small enough to penetrate deep into the lungs and even the bloodstream, which can have adverse effects on human health.

PM2.5 refers to "airborne particles" with a diameter of less than 2.5 micrometers. These particles are small enough to penetrate deep into the lungs and even the bloodstream, which can have adverse effects on human health.

PM2.5 are often composed of various elements and compounds, such as :

  • Sulfates and nitrates: From industrial and vehicle emissions.
  • Soot and dust: from fossil fuel combustion, forest fires and industrial activities.
  • Heavy metals: such as lead and mercury, which can come from a variety of industrial sources.
  • Organic compounds: such as polycyclic aromatic hydrocarbons (PAHs) from the incomplete combustion of organic matter.

High levels of PM2.5 in the air can lead to a variety of health problems, including respiratory disorders, cardiovascular disease and aggravation of pre-existing conditions such as asthma and bronchitis. This is why PM2.5 levels are often monitored and regulated to protect public health.

Here are measurements of different PM 2.5 air qualities:

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