Air Quality | The Asian Age

Wednesday, Apr 24, 2024 | Last Update : 09:43 PM IST

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The main measure of air quality is the concentration of fine particles or Particulate Matter that has a diameter less than 2.5 micrometers — it is called PM2.5.

Understanding the numbers

An AQI between 150 and 200 is unhealthy; between 350 and 500 is classified as very

03 Dec 2017 12:19 AM

AQI value between 301-400 is classified as 'very poor'. Prolonged exposure to such air quality may trigger respiratory illness, the CPCB says. (Photo: File)

Delhi: Air quality becomes ‘very poor’ again

The Central Pollution Control Board's (CPCB) National Air Quality Index has Delhi in the 'very poor' zone with a score of 326.

20 Nov 2017 6:20 PM

On Tuesday too, the city recorded an AQI of 202, which again falls under the “poor” category. (Photo: AP)

Parts of city, suburbs witness poor air quality

IITM scientists are attributing this to the dip in temperature with onset of winter.

17 Nov 2017 2:56 AM

‘Smog-filled Indian, Pak cities may turn into snow globes’

New Delhi & several other North Indian states have been enveloped with toxic smog for over a week, forcing authorities to enforce emergency measures.

17 Nov 2017 2:01 AM

The concentration of PM2.5 and PM10 hovered around 490 and 290 micrograms per cubic metre during the morning hours, marginally below the emergency limit of 500 and 300. (Photo: PTI/File)

Delhi: After a day of gains, pollution back to ‘emergency’ levels

The CPCB’s air quality index for the day (based on pollution levels till 5 pm) had a score of 403, as against Friday’s 468.

12 Nov 2017 2:09 AM

NGT slams civic bodies, govt; bans stubble burning

The NGT also directed the authorities and the civic bodies to sprinkle water where PM 10 is found to be in excess of 600 micrograms per cubic metre.

10 Nov 2017 4:58 AM

The deteriorating air quality has added to the misery, leading to a sharp surge in cases of respiratory problems and doctors doing overtime.

Smog clouds funfare

With air pollution at unprecedented levels, the city has become a virtual gas chamber and it is certainly ‘killing’ all outdoor plans.

09 Nov 2017 12:26 AM

The Supreme Court appointed EPCA directed the Delhi government to quadruple the parking fee and slash the Metro fares immediately as temporary measures.

Four-fold hike in parking charges, Delhi Metro fares cut

The GARP (Graded Action Response Plan) has an advisory for each category of air pollution — emergency, severe, very poor, poor, and moderate.

08 Nov 2017 3:16 AM

People commute through smog in New Delhi on Tuesday. (Photo: Biplab Banerjee)

Delhi air quality reaches alarming levels, primary schools shut

The Delhi government may reintroduce its odd-even scheme to regulate vehicular movement, Mr Sisodia said.

08 Nov 2017 2:50 AM

The scheme was first introduced in January last year to tackle the rising levels of air pollution in the city. (Photo: PTI)

Odd-even may return for clean air

Gahlot directs DTC to gear up for implementation of scheme, chalk out plan.

27 Oct 2017 4:32 AM

On Friday, the air quality in the national capital had turned “severe”, with Delhiites waking up to smog filled sky.

Air quality improves but still in very poor category

8 CPCB monitoring stations record ‘severe’ quality of air.

22 Oct 2017 4:23 AM

Union Environment minister Harsh Vardhan

Air quality much better, says Harsh Vardhan

Mr Vardhan said that for monitoring of air quality days have been classified into ‘good’, ‘satisfactory’ and ‘moderate’.

21 Oct 2017 1:41 AM

Nine out of 17 monitoring stations of CPCB recorded poor quality air, while two recorded very poor quality air.

Delhi’s air quality enters red zone, forecast grim

A ‘poor’ AQI essentially means that people will have breathing discomfort on prolonged exposure to such air.

05 Oct 2017 2:09 AM

Officials said generally air pollutant levels decrease during monsoons and increase during winter.

City air quality worsens as vehicles increase

Civic officials said that generally air pollutant levels decrease during monsoons and increase during winter.

08 Sep 2017 2:18 AM

To get the situation under control, the Indian government announced it would temporarily shut down construction sites and a coal-fired power station. (Photo: FIle)

India must act soon before 'smog chokes Delhi': research

Experts said that crop burning in neighbouring Haryana and Punjab states, car emissions, construction and use of fireworks during Diwali.

21 Jul 2017 11:36 AM

The campaign was initiated by a not-for-profit organisation, Clean Air Asia.

50 students hit streets to study Delhi air quality

The data collected will be used by them to prepare an action plan in each of these areas.

25 Apr 2017 2:21 AM

Introduce destination buses: NGT to AAP govt

It said these services would start from spots where it is convenient for the public at large.

21 Apr 2017 1:25 AM

IAF helicopters fly over the Rajpath during the the 68th Republic Day celebrations in New Delhi on Thursday. (Photo: PTI)

R-Day air quality 'very poor' in Delhi

During parade hours, real-time volume of PM 2.5 and PM 10 shot up to 199 and 237 micrograms per cubic metres.

26 Jan 2017 4:45 PM

Image for representational purose only (Photo: PTI)

Air quality over Delhi continues to remain 'very poor', says traffic police

In Anand Vihar, the Air Quality Index (AQI) was pegged at 585, in R K Puram at 382, in Mandir Marg at 326 and in Gurugram at 316 (AQICN).

12 Jan 2017 1:48 PM

Among these, more than 10,000 vehicles were punished for excessive exhaust emissions. (Photo: AFP)

Beijing files over 13,000 pollution cases in 2016

A total of 10,184 cases, receiving fines totalling 8.7 million yuan, were due to pollution from mobile emission sources.

11 Jan 2017 4:10 PM

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Sanjeev Ahluwalia