A new study reveals strong links between prenatal exposure to air pollution and rising rates of premature and low birth weight deliveries across India, raising urgent questions for public health policy.
India’s latest demographic health survey has revealed that 13% of children are born prematurely, and 17% are born with low birth weight. These findings have been linked to environmental factors such as air pollution and climate variability, raising concern among researchers and healthcare professionals.
According to The Economic Times, a team of researchers from the Indian Institute of Technology Delhi, the International Institute for Population Sciences Mumbai, and academic institutions in the UK and Ireland analysed data from the National Family Health Survey-5 (2019–21). They combined this with satellite-based air quality data to understand how prenatal exposure to fine particulate matter (PM2.5) impacts birth outcomes. PM2.5, a common air pollutant from fossil fuel and biomass burning, is known to penetrate deep into the respiratory system. Their analysis showed a clear association: increased exposure to PM2.5 during pregnancy was linked to a 40% higher risk of low birth weight and a 70% increase in chances of preterm delivery.
The geographical differences in outcomes were also notable. Punjab recorded the highest prevalence of low birth weight (22%), followed by Delhi, Dadra and Nagar Haveli, Madhya Pradesh, Haryana, and Uttar Pradesh. Premature births were more common in northern states like Himachal Pradesh (39%), Uttarakhand (27%), Rajasthan (18%), and Delhi (17%). Meanwhile, states in the north-east such as Mizoram, Manipur, and Tripura reported fewer adverse birth outcomes.
The study also found that an increase of 10 micrograms per cubic metre in PM2.5 concentration was associated with a 5% rise in low birth weight and a 12% rise in premature births. Climate factors like rising temperatures and irregular rainfall patterns were also correlated with negative birth outcomes, pointing to the need for integrated climate-health planning.
The northern districts of India, especially the Indo-Gangetic belt, experience high PM2.5 concentrations and are likely hotspots for these risks. The researchers recommended that these areas be prioritised for intervention. They called for the strengthening of the National Clean Air Program, which was launched in 2019 to improve air quality in non-attainment cities. The study also suggested integrating climate adaptation strategies, such as heat action plans and water access improvements, into maternal and child health services.
Public health outreach, especially among pregnant women, must include education about the effects of air pollution and climate stress on birth outcomes. The researchers stressed that improving environmental quality is not only about long-term sustainability but also essential for improving the health of India’s future generations.
As India aims to reduce maternal and child mortality, the findings underline the importance of clean air and climate resilience in shaping healthy beginnings for millions of children.
