Polycyclic Aromatic Hydrocarbons

Scientific and news articles on particle air pollution.

Polycyclic Aromatic Hydrocarbons

Postby Wilberforce » Sat Jan 29, 2011 8:09 pm

Polycyclic Aromatic Hydrocarbons
Perth Metropolitan Area

The following graph and table include PAH results from the Background Air Toxics Study. The graph is updated as monitoring results become available and includes data from January 2005 to present.

When analysing this graph, the following issues must be considered:

* The horizontal scale on the graph is logarithmic, not linear. Therefore each major segment of the graph is increased by a factor of ten;
* The term 'maximum' refers to the highest concentration measured on any sampling day from the three data collection points over the entire sampling time frame;
* The term 'average' refers to the average concentration calculated from all the measurements over the three sites, over the entire sampling time frame;
* The data from the graph below has been compiled using 24 hour averaged concentrations. If you wish to compare this data with relevant standards the averaging period for the standard used must also be 24 hours;
* Please note that this graph does not yet cover a complete 12 month period of sampling. Therefore the average shown is an average to date and not an annual average. The average to date is not directly comparable to the annual standards, but is provided here for your information.


Sample Collection and Analysis
An air sample is taken over a 24-hour period, every six days from each of three following sites;

* Duncraig (a northern suburb impacted by wood smoke),
* Hope Valley (a southern suburb close to an industrial zone) and
* Queens Buildings (within the central business district).

Sample collection is done using a high volume sampler, modified to sample approximately 300 cubic metres of air over 24 hours through a quartz fibre filter into a polyurethane foam (PUF) canister.

The Chemistry Centre of Western Australia (CCWA) analysed the filter and the PUF. The following table lists all the PAHs identified by the CCWA. Clicking on each PAH will provide a description of the sampling results from each of the three sampling sites and the relevant standards.

more here:
http://portal.environment.wa.gov.au/por ... ema=PORTAL
• The Surgeon General has determined that there is no safe level of exposure to ambient smoke!

• If you smell even a subtle odor of smoke, you are being exposed to poisonous and carcinogenic chemical compounds!

• Even a brief exposure to smoke raises blood pressure, (no matter what your state of health) and can cause blood clotting, stroke, or heart attack in vulnerable people. Even children experience elevated blood pressure when exposed to smoke!

• Since smoke drastically weakens the lungs' immune system, avoiding smoke is one of the best ways to prevent colds, flu, bronchitis, or risk of an even more serious respiratory illness, such as pneumonia or tuberculosis! Does your child have the flu? Chances are they have been exposed to ambient smoke!
User avatar
Posts: 5919
Joined: Wed Jul 25, 2007 11:36 pm
Location: USA

Return to Science Articles

Who is online

Users browsing this forum: No registered users and 1 guest