താഴെ പറയുന്നവയിൽ ഏതാണ് കൂടുതൽ ഇൻഡോർ കെമിക്കൽ മലിനീകരണത്തിന് കാരണമാകുന്നത്?
Aകത്തുന്ന കൽക്കരി
Bകത്തുന്ന പാചക വാതകം
Cകത്തുന്ന കൊതുക് കോയിൽ
Dറൂം സ്പ്രേ.
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