Nitrogen dioxide photograph

Nitrogen Dioxide

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Molar mass46. 0055 g/mol
FormulaNO2
Density1. 45 g/cm³
Boiling point21 °C
ChemSpider ID2297499
Soluble in Water
Date of Reg.
Date of Upd.
ID781350
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About Nitrogen Dioxide


Nitrogen dioxide is the chemical compound with the formula NO ₂. It is one of several nitrogen oxides. NO ₂ is an intermediate in the industrial synthesis of nitric acid, millions of tons of which are produced each year which is used primarily in the production of fertilizers.

London air quality improved by Ulez and Lez - report

London air quality improved by Ulez and Lez - report
Nov 2,2023 3:11 am

... Nitrogen Dioxide levels had also fallen by 18...

Is the UK doing enough to monitor air pollution?

Is the UK doing enough to monitor air pollution?
Oct 15,2023 7:31 pm

... The new inquest confirmed Rosamund s suspicions, finding that Nitrogen Dioxide (NO2) emissions had exceeded both EU and UK levels...

London Ulez expansion: Do clean-air zones reduce pollution?

London Ulez expansion: Do clean-air zones reduce pollution?
Aug 26,2023 9:10 pm

... High levels of air pollutants - for example, Nitrogen Dioxide (NO2) and tiny particles known as fine particulate matter (PM2...

London mayor Sadiq hails Ulez expansion ruling by High Court

London mayor Sadiq hails Ulez expansion ruling by High Court
Jul 28,2023 10:11 am

... Air pollutants, such as Nitrogen Dioxide, can cause and worsen respiratory problems like asthma, and can affect those with heart conditions, according to multiple scientific studies...

Ulez: What is it and why is its expansion controversial?

Ulez: What is it and why is its expansion controversial?
Jul 21,2023 9:31 am

... Petrol and diesel vehicles emit the CO2 that warms our planet, but this scheme is principally aimed not at fighting climate change but reducing levels of two key air pollutants - Nitrogen Dioxide (NOx) and fine particulate matter (PM2...

Can houseplants purify the air in your home?

Can houseplants purify the air in your home?
Jul 20,2023 9:51 pm

... For instance, road traffic produces Nitrogen Dioxide, while moisture and structural issues in buildings can lead to mould...

Government set to miss air pollution goals - report

Government set to miss air pollution goals - report
Jun 17,2022 4:30 am

... The report raises particular concerns about levels of Nitrogen Dioxide, which is released into the air by road vehicles burning fuel...

Bristol mayor flies nine hours for TED climate conference

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... " Cities are responsible for around 75% of CO2 emissions, and we re also prodigious emitters of Nitrogen Dioxide and methane...

Delhi air quality: Severe pollution drives car rationing

May 25,2022 6:45 pm

India's top court has accused state governments of "passing the buck" on Air pollution and failing to take action to tackle Delhi's toxic smog.

The Supreme Court said authorities were only interested in "gimmicks", rather than concrete measures to combat pollution levels.

Levels of dangerous particles in the Air - known as PM2. 5 - are at well over 10 times safe limits in the capital.

City authorities have responded by launching a car rationing system.

"Delhi is choking every year and we are unable to do anything," said Supreme Court Justice Arun Mishra. "The State machinery is not acting… They are passing the buck to each other. . Everybody is interested in gimmicks and elections. "

From 4 to 15 November, cars with odd or even number plates will only be allowed on the roads on alternate days, officials said. Such a system has been used before but it is not clear if it helps lower pollution levels.

Cars are not believed to be the main cause of Delhi's toxic Air , with experts pointing instead to Crop burning by farmers in neighbouring states to clear fields.

Health officials have asked people to stay indoors and refrain from doing any Physical Activity as millions are At Risk of respiratory illness. Schools are closed until Tuesday and the shutdown is likely to be extended until Friday as The City chokes under a thick blanket of smog.

Delhi Chief Minister Arvind Kejriwal said The Car rationing system, known as the "odd-even plan", would take hundreds of thousands of cars off The Road . Those ignoring the rule face a fine of 4,000 rupees (£44; $56) - double that of previous years.

It's a struggle to breathe

by Krutika Pathi, Bbc News , Delhi

Teary eyes, a throat like sandpaper, and a hacking cough that left me Breathless - these were the Side Effects after I went for a walk around my neighbourhood in Delhi.

Whenever "pollution season" starts to set in, I notice the changes in my body rather quickly.

I've lost count of The Number of times I've woken up with a severe cough during the winter season.

From your nose to your chest, it feels like things aren't working the way they should be. On some days, it's just a blocked nose and on others, it's almost a struggle to breathe normally.

The effects go beyond the physical too. I'm constantly thinking about Air Quality Index numbers and whether the Air is breathable - I even activate my Air purifier via an app as I leave work so that my room has clean Air by the time I'm home.

"The perfect storm of conditions during November has created almost 30% higher atmospheric concentrations of fine particulate matter," said a Cornell University study published In July .

Delhi's Geography - it is landlocked and sits on a flat plain that is blocked off by The Himalayas - means it is more drastically affected. Only Public Transport , emergency vehicles, taxis and two-wheelers will be allowed. Women driving alone will also be exempt from the rule.

The Supreme Court has ordered Delhi's state government to produce data which proves that The Car rationing system works.

What's caused the pollution?

Experts say emissions from vehicles are just one of several factors that have turned The City into - in Mr Kejriwal's words - a "gas chamber".

A major cause of The High pollution levels at This Time of year is farmers in neighbouring states burning Crop stubble to clear their fields. This creates a lethal cocktail of particulate matter and gases - Carbon dioxide, Nitrogen Dioxide and sulphur dioxide - All worsened by fireworks set off during the Hindu festival of Diwali a week ago. Construction and industrial emissions have also contributed to the smog.

Efforts to identify a cause have sparked a row between state and federal politicians, with Mr Kejriwal calling on the neighbouring states of Punjab and Haryana to Crack Down on Crop burning. Federal Environment Minister Prakash Javadekar accused Mr Kejriwal of politicising the issue and painting his neighbours as "villains".

The Supreme Court also summoned The Chief secretaries of Punjab, Haryana and Uttar Pradesh states to appear before it to answer questions about efforts to tackle stubble burning.

The Level of PM2. 5 - Tiny particulates that can enter deep into the Lungs - was at one point seven times higher than in the Chinese capital Beijing, which has battled similar pollution problems in recent years.

on Friday as officials declared a Public Health emergency.

Why has it been so bad in recent years?

Part of the reason is a change in Crop cycles and harvesting in the agricultural states of Punjab and Haryana.

A decade ago the two states passed identical laws intended to preserve ground water, which effectively compelled farmers to plant their rice crops in mid-June rather than at the end of April, as was the tradition. This was to enable them to make use of monsoonal rains to grow the heavily water-dependent Crop .

A traffic policeman wears a mask to protect himself at a busy junction

The Delay in the planting cycle meant the harvesting cycle was also delayed. Farmers now have much less time to prepare their fields for the next Crop cycle and burning stubble is a cheap and effective way to clear The Land .

Unfortunately, this coincides with changing wind patterns over Delhi and the rest of North India .

Health tips: How To cope

India's National Disaster Management Authority (NDMA) has recommended some guidelines for residents of Delhi to cope with the elevated smog levels.

They include avoiding strenuous activities and Hard Labour if possible, and exercising indoors. When outdoors, avoiding main roads and congested areas can help, as smaller roads and bylanes tend to be less polluted.

Wearing a mask can help filter out pollutants, but simple surgical masks or comfort masks will not. A smog mask with a respirator is recommended.

Do not burn rubbish or other discarded items outdoors, and try to avoid or share car trips to reduce The Number of cars on The Road .

Are you in Delhi? How has the Air pollution affected your day-to-day life? Tell us about your experiences by emailing

Please include a contact number if you are willing to speak to a BBC journalist. You can also contact us in The Following ways:



india, pollution, delhi, air pollution in india, asia

Source of news: bbc.com

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