Dusty Powder

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Hi
I have noticed that some cans of powder have more powder dust than others. I opened 2 cans of 3031 and one had more dust than the other one. Whats up with that?

It's older powder and some is older than others but it still smells ok. But my sniffer doesn't work the way it useta!:,

thanks a new guy Link

 

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I should add that when I poured the powder from the can into the thrower you could see a lot of dust floating in the air. I was thinking of taking it out doors and pouring it back and forth between containers and let the wind sift it. So it had a better consistency?