Recirculation and closed Windows, cleared the air in the car from 80% of harmful particles

Drivers who during the trips open the Windows to ventilate the car, exposed to 80 percent greater effects of air pollution than those that use the air recirculation system. To such conclusion scientists have come, having conducted the experiment in ten major cities of the world with low per capita income, reported in the journal Science of The Total Environment.

Air pollution is now considered the most serious environmental risks to human health and at the same time, one of the leading preventable causes of death and disease in the world. According to data from the world health organization, in 2016, the air pollution indoors and out was the cause of about 6.5 million premature deaths worldwide. With more than 90 percent of all deaths related to air pollution occur in low and middle income.

Prashant Kumar (Prashant Kumar) from the University of Surrey, together with colleagues decided to find out what level of contamination suffered by drivers in ten major cities of the world with low income, including Dhaka (Bangladesh), Chennai (India), Guangzhou (China), Sao Paulo (Brazil) and Cairo (Egypt). To do this, they set the laser counters of suspended particles PM2.5 and PM10 (common air pollutants) to the salons of the study participants. The measurements were carried out at peak hours morning and evening and after hours in the middle of the day. All this time, researchers monitored how changing the concentration of particles inside of the car when drivers use a recirculation system, air conditioning and just open Windows.

Regardless of the city and model of car, the people who rode with the Windows open was subjected to the most severe effects of air pollution, while the trip included a system of air intake were the most “pure”. The average concentration of fine particles PM2.5 in the natural ventilation ranged from 32 to 136 micrograms per cubic meter in different cities, and particles PM10 — from 64 to 364 micrograms per cubic meter. For the system recirculated air mode the lowest average concentration of fine particles PM2.5 were 6 micrograms per cubic meter, while the highest is 80 micrograms per cubic meter. For particles PM10 figure ranged from 11 to 152 micrograms per cubic metre.

In General, drivers that include recycling, inhale about 80 percent less harmful particles than the ones who open the Windows of their cars. Effect of pollution with the Windows open after hours was 91 and 40 percent less than in the morning and evening peak hours respectively. The study also showed that when Windows are open, the passengers of cars exposed to hot spots of air pollution (where concentrations of PM2,5 is higher than 90 percent of the remaining sections) for about a third of the way.

Recently, scientists have included air pollution to the list of modifiable risk factors of developing dementia. In addition, stay women in terms of air pollution fine dust can affect the speed of physical growth of the child up to the age of four.

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