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  1. #1
    Join Date
    Feb 2006
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    Perth
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    24,142

    Default Dust, smoke and cooking sausages

    As there was a forecast for smoke from bushfires around Perth I've been watching 2 of my dust monitors on and off all day.
    WHO recommendations for PM2.5 is 200 ug/m^3 and half that for seniors and kids or persons with pre-existing conditions.

    The highest it got was around 30 µg/m^3 (usually its <10) around mid morning and I could just smell that it was smoke and there was clearly a smoky haze across the city. Then it slowly came down from there after the sea breeze came in.
    Then at about 5:30pm SWMBO decides we're having lean beef sausages for dinner whereby it shot up to over 250, and now about an hour later it's still ~150 in my office 4 rooms away from the kitchen. This is despite having the stove exhaust hood fan running - we clearly need to run it on a higher setting .
    I should add that during this time I could not see anything visible in the air inside the house.

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  3. #2
    Join Date
    Dec 2005
    Location
    South Australia
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    3,533

    Default

    So sausages are more hazardous than bushfires mmm interesting

  4. #3
    Join Date
    Jan 2014
    Location
    Sydney Upper North Shore
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    3,585

    Default

    Probably need a Clearview in the kitchen

  5. #4
    Join Date
    Aug 2007
    Location
    Saskatoon, SK, Canada.
    Posts
    1,130

    Default

    Bob you should look up how much oil mist in the air is acceptable in order to truly know if you need better kitchen ventilation, or if like the dusty, recommend moving the stove outside.

    Pete

  6. #5
    Join Date
    Feb 2006
    Location
    Perth
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    Default

    Quote Originally Posted by QC Inspector View Post
    Bob you should look up how much oil mist in the air is acceptable in order to truly know if you need better kitchen ventilation, or if like the dusty, recommend moving the stove outside.

    Pete
    Oil mist is nominally 5mg/m^3 but it's not just oil mist, particulates from cooking dust contains a spectrum of (burnt) hydrocarbon fragments similar to that emitted in internal engine exhausts.

    Quote Originally Posted by China View Post
    So sausages are more hazardous than bushfires mmm interesting
    In terms of dust levels yes BUT cooking sausages is relatively quick process even if the particulates hang around for a couple of hours , whereas bushfires can generate weeks of high particulate level exposure.

    Risk is "particulate levels" X "exposure time" which is why the average DIY who does a couple of hours wood work in the weekend is at low risk. In contrast to the retired turner who spends 40 hours in their shed needs to take thinks a bit more seriously.

  7. #6
    Join Date
    Nov 2013
    Location
    Caboolture QLD AU
    Posts
    778

    Default

    Hi Bob,

    This company obviously has an interest in selling AIR treatment products, I actually use some of their products as they are Australian, and where possible, use less toxic natural ingredients.

    This is more a "something to think about" paper, and may be of interest to those of us who have Mold sensitives.

    https://san-air.us16.list-manage.com...c&e=013756de86

    Mike.

    EDIT: The slides shown appear to be mold colony test slides.

  8. #7
    Join Date
    Feb 2016
    Location
    Perth WA Australia
    Posts
    553

    Default

    Quote Originally Posted by BobL View Post
    Risk is "particulate levels" X "exposure time" which is why the average DIY who does a couple of hours wood work in the weekend is at low risk. In contrast to the retired turner who spends 40 hours in their shed needs to take thinks a bit more seriously.
    Bob, in your research is the exposure time cumulative? or does it "resets" after a period of no or minimised exposure?

  9. #8
    Join Date
    Feb 2006
    Location
    Perth
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    24,142

    Default

    Quote Originally Posted by tonzeyd View Post
    Bob, in your research is the exposure time cumulative? or does it "resets" after a period of no or minimised exposure?
    I don't think this has been investigated in detail.
    It probably depends on things like the type of wood and the individual person.
    Certainly allergic type reactions can be triggered by increasingly smaller doses and very short exposures.

  10. #9
    Join Date
    Jan 2014
    Location
    Sydney Upper North Shore
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    3,585

    Default

    Smoke haze north of Sydney is bad today so I thought I’d do a particle count under the Pergola.

    I have the “genetic” counter that most people bought on eBay. It has two screens that you can switch between.

    What I don’t understand is the difference in readings between the two screens. These are the screens.

    Normal screen

    4A845061-8FBA-406E-8A9B-8AD5A4E61A53.jpg


    Other screen

    D82C35B9-E960-44C4-A575-83665B0E5BF7.jpg



    Anyone got any ideas re the reading variation?

  11. #10
    Join Date
    Feb 2006
    Location
    Perth
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    24,142

    Default

    Quote Originally Posted by Lappa View Post
    What I don’t understand is the difference in readings between the two screens.
    I normally compare the readings of the normal screen with those of my other detectors, but I will now switch between the two screens.

    Currently mine are all showing ~ 1µg/m^3

  12. #11
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    Jan 2014
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    Sydney Upper North Shore
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    Default

    I uploaded the wrong normal screen picture - now corrected.

  13. #12
    Join Date
    Jan 2014
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    Default

    Been sitting awhile..Temp now 38.9oC

    Normal screen

    FF5E2C58-B735-4013-BBB5-AB67811AE8D8.jpg


    Other screen

    3A7C4027-85F4-4EA2-9423-B6023CD363BD.jpg

    Still showing major variations.

  14. #13
    Join Date
    Jan 2014
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    Sydney Upper North Shore
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    Default

    3.00pm. Levels are high and still the large variation.

    Normal

    510804C0-11C3-4D03-9732-7F927FF119C1.jpg


    Other

    D652AAC7-C973-41DB-A6C9-488F21A3AA18.jpg

  15. #14
    Join Date
    Jan 2014
    Location
    Sydney Upper North Shore
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    Default

    Cold change coming through and levels are coming down. At these lower levels, the readings are now almost the same ?

    Normal

    FD0F0002-A054-49C2-8FB6-71D189681737.jpg

    Other

    2CA877FB-18AD-4BDD-841C-A8496E43581D.jpg

  16. #15
    Join Date
    Feb 2006
    Location
    Perth
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    24,142

    Default

    I cooked some burgers for dinner.

    When my PM7300 counter said PM10 of 300, the little generic unit said 211 on "normal" screen and 328 on "other" screen.
    Looks pretty consistent one screen over estimates and the other under estimates.

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