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Studies by his group and others, Rahman says, suggest that vaping is not safer than smoking: Its equally bad. Weakened defenses Last year in San Diego at a meeting of the American Thoracic Society, Laura Crotty Alexander reported that vaping can make it harder for the body to kill germs ( SN: 6/28/14, p

The AQI scale can offer insight into who might be most affected by the air pollutants that day

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It is important to critically assess the limitations of MCDA and to recognize that results are derived solely from qualitative factors and the opinions of participants