Parts of the United Kingdom nuclear weapons complex use high volume air samplers, which employ a filter to collect and monitor particulate emissions.

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1 The World Health Organization recognizes six main types of air pollutants carbon monoxide, nitrogen dioxide, particulate matter, sulphur dioxide, tropospheric ozone and suspended particulate matter.

Because now the light is going through a yellowish filter and then a purplish filter.

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Eli Pariser Beware online filter bubbles

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And we filter our own water.

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That's the main use of that filter.

Michael Pritchard's water filter turns filthy water drinkable

He has no filter for what he says.

We give them these little pieces of filter paper.

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These kinds of experiments, they filter into architectural models.

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We are all supposedly straining to burst our filter bubbles.

We think that we can actually create a crowdsourced filter.

Iran provides chemical analyses of samples taken from cultural heritage artefacts and sites which suggest contact with particulate matter and hydrocarbons, but they are not sufficient to enable the Panel to determine the time of contact or the origin of the particulate matter.

The particulate is sent for analysis, using alpha, beta and gamma spectroscopy, together with mass spectroscopy techniques.

I think there's something poetic here, that these pictures taken with ultraviolet filter, the main use of that filter is for astronomers to take pictures of Venus actually the clouds of Venus.

They show us filter paper they've used to collect the animals' blood.

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And according to them, this creates an artificial lung in the filter.

Your model of the world is the filter. That's what's shaping us.

And one oyster can filter up to 50 gallons of water a day.

For instance, tropospheric ozone is a powerful greenhouse gas and particulate pollutants can have strong effects on local and regional climate.

And the plants will filter, by the roots, the dirty water of the fish.