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A level-A mask is for heavy pollution use when the PM2.5 concentration is above 500 microgram per cubic meter. A level-D mask is prepared for medium and low air pollution. Following the instruction and trying it on to check whether a mask perfectly fits on your face is the third step.
Talk of The Town: From sports celebrities to murderers South Africa's hero Oscar Pistorius was not the first sports star falling from grace for committing a murder.
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