Surgical mask is more effective than cloth mask against corona, its filtration efficiency is 95% | कोरोना के खिलाफ कपड़े के मास्क से ज्यादा इफेक्टिव है सर्जिकल मास्क, इसकी फिल्ट्रेशन एफिशिएंसी 95%
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