The pollution to the large particles cause asthma in children
Published the 16.12.2017 at 15: 00
pollution airgrosse particulesasthme
Children exposed to large particles in suspension in the air – a mixture of dust, sand, and automotive products off-gas exhaust, such as rubber tires, are more likely to develop asthma.
These results are from a study on more than 7,000,000 children, published December 15 in the American Journal of Respiratory and Critical Care Medicine, highlight the negative long-term effects of these airborne pollutants that are relatively large – a common fact of daily life in the city centre – on the lung health, especially in children under 11 years of age.
Studies have long shown links between increased risk of asthma, heart disease and fine particulate matter, inhaled with the air. Here, it is the relationship between the larger particles and lung diseases that is promoted.
To be clear, the fine particles are defined as particles measuring at a maximum of 2.5 micrometers from 2.5 to 10 micrometers for the largest particles. In comparison, a human hair has a thickness of between 50 and 70 micrometers.
To investigate the impact of respiratory coarse particles, the researchers from the John Hopkins University have analysed the diagnostic information and treatment on asthma at the national level collected from 7 810 025 children aged 5 to 20 years.
After adjusting their results to take account of differences in ethnicity, gender, age, level of poverty, education and the urban density, the team found that each microgram/m3 increase of 0.6% emergency department visits for asthma, and 2.3% of the hospitalizations.
However, the researchers relativize their results because of the low number of national sites monitoring the particles.