India 2018 Air Quality Report

Air quality in five of India’s major cities saw little improvement in 2018. In short, air quality was flat in Hyderabad year over year, while air quality worsened in Mumbai and Kolkata. Here’s the full data to show you just how bad India’s air quality levels were in 2018:


India major cities air quality 2015-2018 PM2.5 data

Worsening air quality in India comes at a time when China is cutting its air pollution. Analysis of 2018 air quality data showed that air quality improved in 14 of China’s 15 major cities.


Air Quality Worsens in Two Major Cities


PM2.5 pollution—particles smaller than 2.5 microns in diameter—was up 17% in Kolkata. Kolkata now surpasses nine times the World Health Organization annual limit.


Kolkata air quality air pollution AQI


Mumbai also saw air quality worsen in 2018. Mumbai’s PM2.5 pollution increased increased 15% over 2017.


Mumbai air quality air pollution AQI


Famous for its air pollution, Delhi saw air quality improve 5% over 2017. Despite the improvement, Delhi’s air quality still ranks as the worst of these major cities.


India major cities air quality rankings cleanest air


In contrast, Chennai ranked as having the cleanest air in 2018. Chennai’s PM2.5 levels averaged less a third of Delhi’s in 2018.


Microscopic Particles in the Air


The analysis is based on PM2.5 pollution, particles smaller than 2.5 microns in diameter that can penetrate deep into the lungs and even enter the bloodstream. Studies have shown that PM2.5 raises blood pressure, inflammation, and rates of heart attacks and strokes.


PM2.5 air pollution particulate


The analysis uses over 175,000 hourly air quality data points from the US Embassy and consulates in five major Indian cities. This data is open for researchers, although it is limited. It comes from only one pollution sensor in each city, and pollution can vary between neighborhoods.


India air quality air pollution


Read more: See detailed reports on India air quality for Delhi, Kolkata, Chennai, Hyderabad, and Mumbai.


Studies Document Protective Effects of Purifiers, Masks


Despite the harms of PM2.5, studies have found that wearing masks prevents harmful effects on blood pressure and heart rate variability. Similarly, placebo-controlled studies of air purifiers have found that reducing particulate in the home prevents harm to blood pressure, inflammation, and immune response—even among young, healthy twenty-year-olds.


Smart Air is a certified B Corp committed to combating the myths big companies use to artificially inflate the price of clean air. To help people living in polluted cities protect themselves, Smart Air provides empirically backed, no-nonsense purifiers and masks, thereby helping to lower the cost of clean air.


Ladakh Mini Air Purifier CADR Data IQ Air BlueAir


Free Guide to Breathing Safe

Want to learn more about breathing clean air? Join thousands more and stay up to date on protecting your health.

Leave a Comment

Smart Air low cost purifiers

Smart Air is a social enterprise and certified B-Corp that offers simple, no-nonsense air purifiers and provides free education to protect people from the harms of air pollution. We are proud to be the only certified B-Corp dedicated to fighting air pollution.

Certified B-Corp air purifier company