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Relevance: GS Paper III — Environment & Health; GS Paper II — Public Health Source: EMBO Molecular Medicine / AIIMS Delhi, 2026

1 · What happened

A landmark ICMR-funded study by AIIMS, Delhi, published in EMBO Molecular Medicine, has mapped how urban air pollution crosses the placental barrier and harms unborn babies.

The team studied 994 women from highly polluted Delhi and the cleaner town of Deoghar, Jharkhand, and ran parallel rodent trials. They found that fine particles silence a key foetal growth protein and damage the baby’s development before birth.

2 · How Pollution Reaches the Baby

The placenta is an organ that joins the mother and baby. It is supposed to act as a filter, supplying oxygen and nutrients while keeping toxins out. The study shows that PM2.5 and PM10 particles slip past this filter.

The Pollutant
PM2.5 & PM10
PM2.5 particles are ≤2.5 micron — so tiny they enter the mother’s blood, reach the placenta and even the foetal system. PM10 is slightly larger but also harmful.
Policy Response
National Clean Air Programme
NCAP (2019) targets a 40% cut in PM10 levels by 2026 compared to 2017. Critics say it must now equally focus on the more dangerous PM2.5.
The Mechanism
IGFBP3 Silenced
Particles cause inflammation and switch off the IGFBP3 growth protein. They also rewrite epigenetic switches — turning vital genes on/off and stopping the placenta from forming properly.
The Harm
Preeclampsia & LBW
In Delhi mothers — sharp rise in preeclampsia (pregnancy high BP). In rodents — placentas smaller, litter size down 25%, newborn weight down 34%; later, anxiety and poor motor skills.

  • DOHaD theory: The Developmental Origins of Health and Disease theory says harmful exposures during pregnancy can shape a child’s health for life — the study strongly supports this.
  • Long-term cost: Pre-term birth, low birth weight and brain-development issues add to India’s burden of chronic diseases in the next generation.
  • SDG linkage: Directly relevant to SDG 3 (Good Health) and SDG 11 (Sustainable Cities).

UPSC Value Box
PM2.5 & PM10 Particulate Matter — fine dust particles in air. PM2.5 is ≤2.5 microns (enters lungs and bloodstream); PM10 is ≤10 microns.
ICMR Indian Council of Medical Research — apex body for biomedical research under the Ministry of Health & Family Welfare; HQ at New Delhi.
Placental Barrier Biological filter that connects mother and foetus, supplies oxygen/nutrients, and is meant to block toxins from reaching the baby.
Preeclampsia Pregnancy complication marked by high blood pressure and organ damage; major cause of maternal and infant mortality.
Epigenetics Study of how environment turns genes on or off without changing the DNA itself. Pollution can change these “switches” in babies.
NCAP National Clean Air Programme (2019) under MoEFCC. Revised target: 40% reduction in PM10 by 2026 (over 2017 levels) across non-attainment cities.
DOHaD Developmental Origins of Health and Disease — theory that exposures in the womb shape lifelong health and chronic disease risk.

MCQ Practice Question
Q. With reference to air pollution and the National Clean Air Programme (NCAP), consider the following statements:

  1. PM2.5 refers to particulate matter with a diameter of 2.5 millimetres or less, which is too large to enter the human bloodstream.
  2. The National Clean Air Programme was launched in 2019 by the Ministry of Environment, Forest and Climate Change to reduce particulate matter levels in identified non-attainment cities.
  3. The Developmental Origins of Health and Disease (DOHaD) theory suggests that environmental exposures during pregnancy can influence a person’s long-term health and disease risk.

Which of the statements given above is/are correct?
(a) 1 and 2 only    (b) 2 and 3 only    (c) 1 and 3 only    (d) 1, 2 and 3

Answer: (b) 2 and 3 only

  • Statement 1 — Incorrect (the trap): PM2.5 is measured in micrometres (microns), not millimetres. Its diameter is ≤2.5 microns — small enough to enter the bloodstream and even reach the placenta and foetus.
  • Statement 2 — Correct: NCAP was launched in 2019 by MoEFCC with a target of reducing PM levels across non-attainment cities; the revised target is a 40% cut in PM10 by 2026 over 2017 levels.
  • Statement 3 — Correct: DOHaD theory holds that exposures during critical pregnancy windows can permanently shape a child’s health and risk of chronic disease later in life.

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