The crux of the problem which many of us are not aware of is indoor air pollution is real and equally dangerous because the indoor air is far more concenrated with pollutants than outdoor air; they will be circulatingwithin the four walls in a close environment. More than 2.2 million people die annually due to indoor air pollution as oppossed to 500,000 annual deaths from outdoor air pollution it is mentioned. When it comes to many sources of indoor air pollution, they vary among developed and developing nations.
In particular, in developing countries, the sources are well prounced and the resultant air pollutuion has a far greater impact. The main reason is for cooking, heating, wood, charcoal and animal dung are used inside homes as fuel. If the cooking area does not have proper ventilation to allow the pollutants to escape, the people inside the house will be breathing in carbon monoxide and other dangerous contaminants. Persistent indoor air pollutants from these sources cause serious human health issues leading to such as pneumonia, bronchitis, cancer, heart disease and asthma. It is estimated that every year 1.6 million people die from indoor air pollution caused by old traitional method of cooking . More than half of the population of developing nations depend on the old method of cooking.
|Indoor air pollution www.netclipart.com|
|Indoor air pollution. eschooltoday.com/|
roofs -- roofs that are planted with vegetation will do the trick - improve the indoor air quality. The researchers point out the environmental bebefits of roff-top green are reduction
in carbon dioxide, urban heat and storm-water runoff. What the researchers did was the university's departments of Mechanical and Materials Engineering, Biology and the Honors College, chose the roof of a big-box retail store in North Portland and set up measuring devices To make comparitive studies, they split the area between a green roof and a more conventional white membrane roof. They measured the air coming into the building from outdoor intake vents from the green roof snd unplanted roof. Surprisingly they found that the air coming in from the green roof area had modestly lower ozone levels than the air coming in from the unplanted area. They noted that the vegetation trapped and filtered the ozone in the outdoor air.
The key factor is dry deposition, the trapping effect - a process in which airborne particles collect or deposit themselves on solid surfaces. Obviously, it is a natural process that is key to removing pollutants from the atmosphere. Though the study was conducted just for two days, research on a long term basis will further reveal the benefits of green roof top on indoor pollution and the role played by pollutants as well as ozone.
Materials provided by Portland State University. Note: Content may be edited for style and length.
Pradeep Ramasubramanian, Olyssa Starry, Todd Rosenstiel, Elliott T. Gall. Pilot study on the impact of green roofs on ozone levels near building ventilation air supply. Building and Environment, 2019; 151: 43 DOI: 10.1016/j.buildenv.2019.01.023