Qualité de l’air à Calcutta

Indice de qualité de l’air (IQA) et pollution de l’air (PM2.5) à Calcutta

DERNIÈRE MISE À JOUR (Heure locale)

1.42M personnes suivent cette ville

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Carte IQAir avec points colorées AQI

Contributeurs de données sur la qualité de l'air

Données fournies par

Contributeurs

4

Sources de données

5

Le logo du profil de Central Pollution Control BoardLe logo du profil de West Bengal Pollution Control Board (WBPCB)Le logo du profil de AirNow Department of StateLe logo du profil de U.S. Department of StateLe logo du profil de Central Pollution Control BoardLe logo du profil de West Bengal Pollution Control Board (WBPCB)

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Temps

Quel temps fait-il actuellement à Calcutta?

Icône météo
TempsBrouillard
Température59°C
Humidité94%
Vent3.6 mp/h
Pression1013 mb

Classement IQA des villes en direct

Classement en direct des principales villes en Inde

#cityIQA US
1 Pitampura, Delhi

435

2 Delhi, Delhi

396

3 Dadri, Uttar Pradesh

356

4 Loni, Uttar Pradesh

351

5 Alipur, Delhi

348

6 Daurala, Uttar Pradesh

343

7 Sector, Uttar Pradesh

302

8 Bawana, Delhi

293

9 Dasna, Uttar Pradesh

288

10 Artist Village, Maharashtra

260

(Heure locale)

CLASSEMENT MONDIAL DE l’IQA

Classement IQA en direct à Calcutta

Classement de la qualité de l’air en direct à Calcutta

#stationIQA US
1 US Consulate in Kolkata

230

2 Rabindra Bharati University, Kolkata - WBPCB

218

3 Jadavpur, Kolkata - WBPCB

196

4 Ballygunge, Kolkata - WBPCB

184

5 Bidhannagar, Kolkata - WBPCB

179

6 Rabindra Sarobar, Kolkata - WBPCB

178

7 Victoria, Kolkata - WBPCB

172

(Heure locale)

CLASSEMENT MONDIAL DE l’IQA

IQA US

190

IQA en direct
Mauvais pour la santé

Visage humain indiquant le niveau AQI

Vue d’ensemble

Quelle est la qualité de l’air actuellement à Calcutta?

Niveau de pollution de l’airIndice de pollution de l’airPrincipaux polluants
Mauvais pour la santé 190 IQA UStrendPM2.5
PolluantsConcentration
PM2.5
131.3 µg/m³trend
pm10
177.8 µg/m³trend
o3
28 µg/m³trend
no2
40.8 µg/m³trend
so2
8 µg/m³trend
co
820 µg/m³trend

Recommandations de santé

Comment se protéger de la pollution de l’air à Calcutta?

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Prévision

Prévision de l’indice de qualité de l’air (IQA) à Calcutta

JourNiveau de pollutionTempsTempératureVent
lundi, janv. 18

Très mauvais pour la santé 215 IQA US

Visage humain indiquant le niveau AQI
mardi, janv. 19

Mauvais pour la santé 191 IQA US

Visage humain indiquant le niveau AQI
mercredi, janv. 20

Mauvais pour la santé 185 IQA US

Visage humain indiquant le niveau AQI
jeudi, janv. 21

Mauvais pour la santé 185 IQA US

Visage humain indiquant le niveau AQI
Aujourd’hui

Mauvais pour la santé 183 IQA US

Visage humain indiquant le niveau AQI
Icône météo80.6°57.2°
Vent tournant à 325 degré

6.7 mp/h

samedi, janv. 23

Mauvais pour la santé 195 IQA US

Visage humain indiquant le niveau AQI
Icône météo82.4°57.2°
Vent tournant à 324 degré

4.5 mp/h

dimanche, janv. 24

Très mauvais pour la santé 201 IQA US

Visage humain indiquant le niveau AQI
Icône météo86°59°
Vent tournant à 244 degré

2.2 mp/h

lundi, janv. 25

Mauvais pour la santé 188 IQA US

Visage humain indiquant le niveau AQI
Icône météo89.6°62.6°
Vent tournant à 178 degré

4.5 mp/h

mardi, janv. 26

Mauvais pour la santé 198 IQA US

Visage humain indiquant le niveau AQI
Icône météo91.4°64.4°
Vent tournant à 231 degré

4.5 mp/h

mercredi, janv. 27

Mauvais pour la santé 196 IQA US

Visage humain indiquant le niveau AQI
Icône météo89.6°64.4°
Vent tournant à 273 degré

0 mp/h

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Historique

Graphique de l’historique de la qualité de l’air à Calcutta

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ANALYSES ET STATISTIQUES DE LA QUALITé DE L’AIR POUR Calcutta

How polluted is the city of Kolkata?

Kolkata, sometimes known as the city of joy, is located approximately 80km away from the border to Bangladesh, and is the capital city of the Indian state of Bengal. Famous for its long history of culture, commerce as well as literary and artistic thought, it attracts many visitors, both internationally and locally, as well as having a rapidly growing and somewhat large population of inhabitants, some four and a half million as recorded in 2011, and with 14.85 million as of 2020, showing massive growth not only economically but in regards to the amount of people living within the megacity limits.

Kolkata was shown to have a PM2.5 reading of 59.8 as recorded in 2019, as a yearly average. This puts it directly into the ‘unhealthy’ bracket rating, which requires a PM2.5 reading of anywhere between 55.5 to 150.4 μg/m³ to be classified as such. This reading places it in the position of 61st most polluted city worldwide in 2019, and coming in at 28th place out of all cities ranked in India. This shows that Kolkata is indeed very polluted, and whilst it may not suffer from the same extreme levels of pollution that other cities do, it certainly has many months that see very hazardous levels of pollution.

When is pollution at its worst in Kolkata?

Observing the data recorded over 2019, the one month that stood out above all others was January, which came in with a PM2.5 reading of 176.1 μg/m³, putting it squarely into the ‘very unhealthy’ bracket, one which requires a reading of any PM2.5 number between 150.5 μg/m³ and 250.4 μg/m³ to be given such a title.

PM2.5 (and its larger cousin, PM10) refers to fine particulate matter that is 2.5 or less micrometers in diameter, or 10 if referring to PM10, which is somewhat less deadly due to its larger size but still has the ability to cause many issues when inhaled over long periods of time.

With a rating of 176.1 μg/m³ in January, the whole population would be at a very large risk of adverse health effects, with young children, the elderly and those with predisposition to being sick at highest risk. To give some comparison, the cleanest month recorded in Kolkata was 19.7 μg/m³, nearly 9 times lower than the highest months reading. The disparity is somewhat alarming, with some serious causes being behind this large spike of pollution.

What are the main causes of pollution in Kolkata?

The main causes of pollution in Kolkata would be similar to many other states and cities in India, although with differences in what times of the year see their worst spikes in smoke and haze, due to several different factors. Vehicles always play a large role in the ambient year-round pollution levels, with highly dense and populated cities often playing host to an equal, if not a greater number of vehicles. Cars and motorbikes as well as lorries and trucks would all be emitting vast quantities of smoke, haze and pollution into the air, with ones running off of fossil fuels such as diesel putting out larger amounts of pollution.

Pollutants arising from the vehicular industry would include black carbon and volatile organic compounds (VOC’s), both of which are released from the incomplete combustion of fossil fuels such as diesel.

They are also produced from practices such as slash and burn farming, setting organic waste and refuse on fire, as well as the use of coal to provide power to the numerous factories and industrial plants located around Kolkata. The main pollutant released from the vehicular industry (as well as from all combustion sources) would be nitrogen dioxide (NO2), which is found in high concentration around any area worldwide that sees high volumes of traffic, and indeed Kolkata would be no exception, with levels of nitrogen dioxide constantly being a looming threat in its rise, due to the population explosion and therefore rise in personal vehicles.

What is Kolkata doing about its pollution levels?

Kolkata is implementing a number of incentives over the last few years out of growing concern for its pollution levels. A large amount of resources have been poured into the public transport sector, which would go a long way to helping reduce the levels of ambient pollution, in particular the aforementioned nitrogen dioxide.

Noxious smokes and fumes released from diesel fuels would also be reduced, as with newer public transport infrastructure often means newer models of public buses, as well as trains that rely on alternative fuel sources, and as such they would be emitting far less smoke and haze, usually thick with PM2.5 and other toxic compounds such as carbon monoxide (CO), ozone (O3) and soot, which contains large amounts of the aforementioned black carbon.

Besides being highly dangerous to breathe in, black carbon also has grave consequences in terms of climate control, having a prominent effect on a city due to its ability to convert solar radiation directly into heat. Thus, with large initiatives in the public transport sector, would have marked differences in pollution level reduction, which is already being seen.

Are pollution levels in Kolkata getting better?

Whilst pollution levels in Kolkata still have a way to go in order to see the best health of its citizens, it is apparent that pollution levels have improved over the last few years, with a marked improvement in levels of PM2.5 recorded in 2019 as opposed to the few years prior to that. In 2017, the yearly average of PM2.5 was 76.7 μg/m³, still in the unhealthy rating bracket but considerably higher in number than more recent times.

2018 came in with an even worse reading of 85.4 μg/m³, before finally coming to the improved reading of 2019 at 59.8 μg/m³, representing a drop of 25 μg/m³ of particulate matter in the course of a year.

Whilst Kolkata still has plenty of room for improvement, with the excessive numbers of pollution recorded in January skewing the results massively, its 2019 rating was not too far from being moved down a bracket out of the unhealthy rating and down into the ‘unhealthy for sensitive groups’ bracket. Whilst this is still a very long way from the WHO’s target rating of 0 to 10 μg/m³, it would represent a further change in the right direction.