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Particulate Matter

Particulate matter in the air influences how objects appear at different depths. What is this matter? Fundamentally, it is water, another gas, dust, or some other type of visible particulate usually called pollution. Even an ideal, pristine, pollution-free environment has water in the air—even in the desert. The amount in the air gives you clues to

  • The distance to the horizon and where objects lie in relation to it

  • The basic type of climate; the aridness or heaviness of the weather

    Particulate matter does not occur in outer space, save perhaps when the occasional cloud of interstellar dust drifts through the shot. Look at photos of the moon landscape, and you'll see that the blacks in the distance look just as dark as those in the foreground.


  • The time of year and the day's weather

  • The air's stagnancy

  • The sun's location


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