Various dusts


Dusts are very fine solid particles that remain suspended in the air. These are usually particles that separate from materials, tissues, food, skin, animal hair, smoke from combustion ... They can come from our daily activities or from the outside environment. Dust is an accumulation of several components whose composition is unknown. It must be analyzed to know all the particles that compose it. Through the respiratory system, they can penetrate inside the body according to its size.

Les « poussières totales » ont des tailles variant de 10 à 100 microns et qui peuvent être retenues au niveau de la fosse nasale. Les poussières respirables dont la taille varie de 5 à 10 microns peuvent pénétrer dans la trachée, les poumons et les bronchioles. Elles peuvent aussi être avalées ou cracher par l'individu. Les poussières qui sont très fines (0,5 micron) peuvent se déposer dans les alvéoles pulmonaires.

"Total dust" has sizes ranging from 10 to 100 microns and can be retained in the nasal cavity. Breathable dusts ranging in size from 5 to 10 microns can enter the trachea, lungs and bronchioles. They can also be swallowed by the person. Dusts that are very fine (0.5 micron) can be deposited in the pulmonary alveoli. Dust can be found in carpets, fabrics, mattresses, ears, curtains, sofas, ventilation devices and their ducts, fireplaces, kitchen, skirting boards, moldings ... everywhere in the House.

Dust associated with inadequate moisture promotes mite reproduction. These can cause skin irritation, allergies, respiratory problems ... The risks related to dust also depend on the type in question. Individuals may have different effects such as:

  • Difficulty breathing;
  • allergies;
  • Toxic effects on the body;
  • Lesions in the nose
  • Fibrogenic effects (eg connective tissue proliferation in the lungs);
  • Cancer

The dose that the body will absorb varies depending on its concentration and the duration of exposure to the contaminant in question. The risks of toxicity and the intensity of the reaction are proportional to the absorption. The state of health and the proper functioning of the individual's organs can also influence the level of intoxication of a substance. Tobacco smoke can increase the effects of dust on the respiratory tract because it has already decreased the efficiency of the lungs which slows down the cleaning of the respiratory cells. For example, it has been shown that tobacco and asbestos and/or silica when exposure is simultaneous, create a synergistic action that increases the harmful effects of the contaminant.

To reduce the amount of dust present in the environment, it is necessary to...

  • Vacuum a minimum of 1 time per week;
  • Clean up a minimum of 1 time per week;
  • Wash all bedding to eliminate mites;
  • Have the ventilation and heating ducts cleaned;
  • Change and wash filters for purifiers, air conditioners, air exchangers at least twice a year;
  • Limit the number of carpets that accumulate dust;
  • The purchase of duvet covers, mattresses and anti mite pillows is strongly recommended;
  • Decrease the presence of plants in the rooms.