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According to central pollution central board (CPCB) which size of particulate matter are responsible for causing the greatest harm to human health?

$\begin{array}{1 1}(a)\;2.5\mu m\;or\;less\\(b)\;3.5\mu m\;or\;less\\(c)\;4.5\mu m\;or\;less\\(d)\;5.5\mu m\;or\;less\end{array} $

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$2.5\mu m\;or\;less$
Hence (a) is the correct answer.
answered Apr 2, 2014 by sreemathi.v

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