Variety of micro-organisms are present in the air. Spores of Bacillus and Clostridium, ascospores of yeast, cysts of protozoans. gram-negative rods and non-endosporous bacteria like Sarcina lutea and Micrococcus lutea are frequently found in the air of over populated regions. Spores of several microfungi, such as species of Alternaria. Penicillium and Aspergillus are present in abundance in the atmosphere over the oceans.
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