Air pollution in Delhi

Air pollution in Delhi

In January 2016, Delhi, India, improved air quality on its streets when it conducted a 2-week air pollution reduction experiment, with private cars allowed on the streets only on alternate days, depending on license plate numbers.   The idea is not new and has been tried elsewhere (Paris and Rome) but I guess its novelty (“who’d have thought” brigade) to the USA explained why it made The New York Times!

Last year, it was all headlines about Bejing [China] and the air quality citizens had to deal with. However it would seem that actually Beijing’s levels of PM10 (particulate matter up to 10 micrometres in size), a measure of air quality, decreased by 40% from 2000 to 2013, whereas Delhi's PM10 levels have increased 47% from 2000 to 2011.

Delhi's PM10 levels are nearly twice as much as in Beijing, and it has the worst PM 2.5 levels of 1600 cities in the world. Thus the need for the license plate experiment. In a BBC article, you can read more about the reasons “Why Delhi is losing its clean air war” and discover the varied & innovative measures China has taken to ameliorate motor car use.

No doubt spurred on by Delhi’s experiment, a health journalist in Bangladesh alerted the HIFA forum to the equally bad situation in India’s neighbour, Bangladesh.

He declared the main environmental health threat to his country was air pollution. Automobile and industrial emissions in urban areas of Bangladesh, and “polluting fuels and technologies for cooking, heating and lighting” (relied on by millions of his people, and described in Air pollution, women and media). 

Air pollution in Dhaka Bangladesh caused by traffic

Smog from traffic in Dhaka.[NDU Rezwan]










One of the new Sustainable Development Goals aims to help those millions by ensuring universal access to clean fuel and technologies.

We here in UK are also adversely affected by air quality through the impact of motor traffic, in particular diesel cars and buses. A recent report stated that air pollution kills 40000 a year in the UK.  There is talk of a ban on diesel vehicles in London and Paris apparently has already taken this step.

Diesel fuels were championed to reduce CO2 emissions but research has shown that they increase health-damaging particulates in the air we breathe.

Air quality measurement includes particulates

Particulates PM 10 and PM 2.5 are the main focus of attention, both separately increasing the risks for heart attacks and lung cancer [Air pollution linked to higher risk of lung cancer and heart failure], and can trigger asthma. They are the usual two particulates measured. Through HIFA, I learnt of an air quality study in an American neighbourhood, where the local school of public health  was using state of the art air quality monitors designed to capture 28 particulates plus noise and vibration (from motor vehicles going through the neighbourhood).

I wondered how many countries, and indeed local neighbourhoods, are conducting air quality studies? Are Low-and-Middle- Income-Countries learning from our mistakes or simply repeating them? What’s the research base and which countries have acted to reduce (ameliorate) the impact of motor cars? I looked of course to CABI’s Global Health database, and found over 12000 records on “air pollution”,  and over 5500 records on “air quality”. There were 266 records about air pollution and air pollutants in particular neighbourhoods. Clearly neighbourhood studies are “the new boy on the block” (excuse the pun).

Sign up to our free newsletter  Global Health Knowledge Base to get topical updates on global health from CABI.  March 2016's issue is focussed on Air Pollution.

Further Reading

And from CABI's Global Health database, (links for subscribers to Global Health on CAB Direct):

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Strong anti-air pollution policies would prevent 175,000 premature deaths and save $250 billion per year by 2030
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  1. Mart on 15th July 2016 at 1:01 pm

    With the introduction of electric cars and hydrogen powered vehicles, there can be a reduction in air pollution. More discoveries on clean energy will go along way to tackle this problem

  2. Alkè on 16th January 2017 at 11:26 am

    Air pollution is a big issue and governments aren’t doing much to solve this. So it’s our turn to do something, like change our habits and try to use and promote sustainable mobility! Choosing a car also for its good impact on the environment, and not only considering price, fuel consumption and engine power, would be awsome! It’s time to make greener choices…

  3. Benson Mwanza on 29th June 2017 at 9:51 am

    Air pollution is an emerging problem which needs to be addressed as this interferes with our environment,use of petrol cars and reduction on the importation of diesel cars will alleviate this problem,electrical cars should be the way forward.

  4. rose on 29th June 2017 at 1:27 pm

    nice article!

  5. Josh on 30th June 2017 at 7:14 am

    my government should adopt this policies..

  6. Roselyne Tiampati on 30th June 2017 at 8:18 am

    Useful information

  7. Victor on 30th June 2017 at 10:56 am

    Air pollution is a global catastrophe. We need globally binding measures to reduce its negative impacts.

  8. Geospatial &Space Technology on 18th October 2017 at 1:28 pm

    useful information

  9. Geospatial &Space Technology on 19th December 2017 at 11:49 am

    This was a powerful piece.

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