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Airborne bacteria in an urban environment.

R L Mancinelli, W A Shulls

    Applied and Environmental Microbiology
    |June 1, 1978
    PubMed
    Summary

    Urban air contains viable bacteria, with Micrococcus, Staphylococcus, and Aerococcus being most common. Bacterial levels correlate with air pollutants like nitric oxide, nitrogen dioxide, and particulates.

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    Area of Science:

    • Environmental microbiology
    • Air quality research
    • Public health

    Background:

    • Urban air harbors diverse viable bacteria.
    • Understanding bacterial presence and its environmental drivers is crucial for public health.

    Purpose of the Study:

    • To quantify viable bacteria in urban air over two years.
    • To identify dominant bacterial genera.
    • To correlate bacterial levels with meteorological and air pollution parameters.

    Main Methods:

    • Random air sampling over a 2-year period.
    • Isolation and identification of viable bacteria using morphological and biochemical characteristics.
    • Statistical correlation analysis (Pearson product-moment) with environmental parameters.

    Main Results:

    • Bacterial counts ranged from 0.013 to 1.88 organisms/L.
    • Micrococcus (41%), Staphylococcus (11%), and Aerococcus (8%) were the most frequent genera.
    • Significant correlations found: negative with nitric oxide, positive with nitrogen dioxide and suspended particulate pollutants.

    Conclusions:

    • Urban air bacterial concentrations are influenced by air pollution.
    • Nitrogen dioxide and particulate matter are positively correlated with bacterial load.
    • Nitric oxide shows a negative correlation with bacterial presence.

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