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Pollution in Delhi homes worse than outdoors, says study
Published in The Saudi Gazette on 09 - 12 - 2021

India's capital Delhi has alarmingly high levels of indoor air pollution, BBC reports citing new research.
The study found that the levels of PM2.5, the lung-damaging tiny particles in the air, indoors were "substantially higher" than those found on the nearest outdoor government monitors.
But despite that, most households have been unwilling to adopt defense measures, the report added.
Delhi city routinely tops the list of "world's most polluted capitals".
The study by the Energy Policy Institute at the University of Chicago (EPIC), conducted between 2018 and 2020, surveyed thousands of Delhi households across varying socio-economic backgrounds and found that rich and poor households were equally affected.
Researchers said high-income households were 13 times more likely to own air purifiers than low-income households. Yet, the indoor air pollution levels in those homes were only 10% lower than those living in disadvantaged settings.
"In Delhi, the bottom line is - whether someone is rich or poor, no one gets to breathe clean air," said Dr Kenneth Lee, the lead author of the study. "It's a complex vicious cycle."
The World Health Organization (WHO) estimates that globally about seven million people die prematurely each year from diseases linked to air pollution, which it puts on par with smoking and unhealthy eating.
Experts say most of our exposure to air pollution actually happens indoors. According to the Environmental Protection Agency (EPA), the levels of indoor air pollutants can be two to five times higher than outdoors.
This is particularly a cause of concern for India, which has the world's worst air pollution. Home to 22 of the world's 30 most polluted cities, India's toxic air kills more than one million people each year.
Official government data shows Delhi recorded its worst November air in at least six years, with residents not experiencing even one "good" day of air quality through the month. Schools were shut amid worsening pollution levels and the situation was so dire that it also prompted a stern warning from India's Supreme Court.
A mix of factors like vehicular and industrial emissions, dust and weather patterns make Delhi the world's most polluted capital. The air turns especially toxic in winter months as farmers in neighboring states burn crop stubble. And fireworks during the festival of Diwali, which happens at the same time, only worsen the air quality. Low wind speed also plays a part as it traps the pollutants in the lower atmosphere.
Yet, there is a low demand for clear air or adoption of defensive behaviors in Delhi households, according to the new report.
Researchers observed that even when people were offered a free trial of indoor air quality monitor to track pollution levels inside their homes, the take-up rates were low.
"When you do not know about the pollution levels inside your homes, you do not worry about it, and hence you are less likely to take corrective actions," said Dr Lee. "Only with increased awareness, demand for clean air may gain momentum."


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