IndiaPosted at: Sep 2 2025 6:22PM


Invisible bacteria hitch a free ride on city pollution, threaten public health: study

New Delhi, Sept 2 (UNI) In a first-of-its-kind study examining health risks from airborne pathogens over metropolitan cities like Delhi, a team of Indian researchers has uncovered alarming evidence: pathogenic bacteria responsible for respiratory, gastrointestinal, oral, and skin infections are twice as prevalent in densely populated urban areas due to elevated concentrations of fine particulate matter (PM2.5).
The research highlights that the Indo-Gangetic Plain (IGP) — one of the world’s most densely inhabited and polluted regions — faces a unique confluence of meteorological and environmental factors during winter. Western disturbances cause a sharp drop in temperature and a rise in relative humidity, leading to stagnant air and a low boundary layer height. These conditions trap pollutants close to the ground, resulting in heightened microbial concentrations.
Delhi, situated within the IGP, stands out as a rapidly expanding urban hub with one of the highest pollution levels globally. The study confirms earlier findings of significant spikes in airborne microbes during winter but goes further to reveal the critical role of PM2.5 particles as carriers that facilitate the deep lung penetration of pathogenic bacteria.
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