Rank: Forum user 
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Hi I have seen dust monitors measure dusts to PM10 and PM2.5 measurements. However, normal dusts outsdie of EH40 have Work exposure limits of 10mg.m-3 inhalable and 4mg.m-3 respirable.
How do the PM values relate to the WELs? It all looks very confusing. I wouldnt mind getting an instrument to measure to PM10 and PM2.5 but need to know how it relates to the mg.m-3 values we get through annual air monitoring Regards
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Rank: Super forum user 
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Hm, my study notes say that up to 7 microns is respirable and up to 10 microns (so PM10) is inhalable.
Not sure that really helps you though.
I've always had dust measurements done by an occupational hygienist who is able to interpret the results.
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Rank: Super forum user 
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Dusts? PM is Particulate Matter the number refers to the size in microns. The problem with particulate matter is that it sources are a lot broader than dusts. Try not to be distracted in the workplace - EH40 is occupational exposure measured in mg/m3 - if you are enacting workplace controls a Particulate Matter meter currently has no value. If you are chasing PM values stand by to be very dissappointed as there are so many sources you don't stand a snowflake in hell chance of controlling. Certain metro mayors believe that switching to EV and congestion charging will reduce PM - problem is those EV with reinforced tyres and electrical braking also create significant PM in their own right.
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Rank: Super forum user
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Dusts? PM is Particulate Matter the number refers to the size in microns. The problem with particulate matter is that it sources are a lot broader than dusts. Try not to be distracted in the workplace - EH40 is occupational exposure measured in mg/m3 - if you are enacting workplace controls a Particulate Matter meter currently has no value. If you are chasing PM values stand by to be very dissappointed as there are so many sources you don't stand a snowflake in hell chance of controlling. Certain metro mayors believe that switching to EV and congestion charging will reduce PM - problem is those EV with reinforced tyres and electrical braking also create significant PM in their own right.
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