Engeering Horizon

EH OCT 2015 – INDOOR AIR QUALITY

EH OCT 2015 – INDOOR AIR QUALITY

EH OCT 2015 – INDOOR AIR QUALITY
November 06
15:20 2015

PEOPLE TEND TO SPEND MORE TIME INDOORS THAN OUT, AND IN MANY CIRCUMSTANCES, THE AIR WE BREATHE INDOORS IS EVEN MORE POLLUTED THAN OUTDOOR AIR.

Sources of Indoor Air Pollution

• Combustion (to heat water, cook and space heating) can produce elevated levels of CO and NO X
• Certain photocopying machines emit ozone.
• Formaldehyde emissions from particle board, plywood, urea – formaldehyde foam insulation.
• Asbestos used for fireproofing and insulation.
• Various volatile organics emitted from household cleaning products.
• Many pollutants, such as cigarette smoke and radon when emitted indoors can be concentrated, leading to harmful exposure levels.
• Tobacco smoke contains numerous known or suspected carcinogens, including benzene, hydrazine, benzo ‐ α‐ pyrene (BaP) and Nickel.
• Smoke particles are small, averaging about 0.2 μm, so they are easily carried into the deepest regions of the lungs.
 A single cigarette smoke gives off on the order of 1012 smoke particles, most of which are released while the cigarette is simply smoldering in the air (sidestream smoke) rather than when a smoker takes a puff (mainstream smoke).
• Hence non smokers are also exposed to significant amount of smoke particles.
• Other indoor air pollutants arising from tobacco smoke include carbon monoxide, nicotine, nitrosamines, acrolein and other aldehydes.
• Another potentially important source of indoor air pollution is caused by wood‐burning stoves and
fireplaces.
• Wood combustion produces CO, NOX, hydrocarbons and respirable particles and some emissions that are suspected carcinogens like benzo ‐ α‐pyrene.

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Engineering Horizons

Engineering Horizons

“Engineering Horizons” is the first & leading technical magazine of Pakistan covering Process, Mechanical, Metallurgical, Mining, Electrical & Electronics field under a single cover. We also feel pleasure in saying that this is the only magazine of its own kind & style, which is widely circulated in all Engineering Sectors of Pakistan.

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