How do AQI readings work? Why do the pollution board and IQAir data differ?
1 month, 1 week ago

How do AQI readings work? Why do the pollution board and IQAir data differ?

Hindustan Times  

As winter sets in, Delhi's air quality has continued to deteriorate, remaining a “very poor” level with 334 overall AQI on Wednesday, according to the Central Pollution Control Board. Commuters drive amid dense smog in New Delhi While the CPCB has recorded the air quality index at 334, another platform, IQAir, a Swiss air quality technology company, showed that Delhi's AQI is around 1190. AQI, or Air Quality Index, is a numerical scale that measures certain pollutants and their concentration to communicate the quality of air in a specific area. Real-time data Platforms such as IQAir update the AQI of a city and its different regions much faster with real-time data, while the CPCB gives one reading which applies to the region for a day.

History of this topic

Delhi AQI remains ‘severe’ at 401 as rain fails to bring air pollution levels down
17 hours, 18 minutes ago
Delhi's ‘severe’ air quality unchanged despite drizzle
1 day, 5 hours ago
Delhi’s AQI back in ‘severe’ zone amid GRAP-4 restrictions
2 days, 1 hour ago
Delhi air pollution: AQI back to ‘severe’ as cold wave continues to grip national capital | Updates
2 days, 16 hours ago
Delhi's AQI improves after 3 days, to jump back to ‘severe’
3 days, 1 hour ago
Delhi chokes as air quality nears 'severe plus', dense fog amid cold wave - Delhi News
5 days, 19 hours ago
Delhi's air quality remains 'severe', thick smog envelopes city | Check IMD's prediction
5 days, 19 hours ago
Weather body issues alert for dense fog in Delhi as air quality deteriorates
5 days, 19 hours ago
No relief from toxic air despite curbs in force
5 days, 19 hours ago
Cold wave in Delhi to worsen this winter? City shivers, IMD predicts mercury may drop to...
6 days, 17 hours ago
Delhi's pollution worsens as Air Quality Index enters 'severe plus' category
6 days, 19 hours ago
Delhi Airport issues advisory to flyers amid spike in air pollution; AQI hits ’severe plus’ category in some areas
1 week ago
Delhi's air quality ‘severe’ at over 420 as GRAP 4 returns | Check area-wise AQI
1 week ago
Moderate fog in Delhi as AQI remains ‘severe’; minimum temperature 5.9°C
Trending News
1 week ago
GRAP IV back as AQI breaches 400-mark in city
1 week ago
Delhi pollution: Air quality slips to severe category; CAQM tightens curbs
1 week, 1 day ago
Stricter anti-pollution measures reinforced in Delhi as AQI drops amid cold wave
1 week, 1 day ago
Delhi's air quality drops to very poor again, no immediate relief in sight
Top News
1 week, 1 day ago
Delhi breathes in cleanest first half of December since AQI data collection started in 2015
1 week, 2 days ago
Delhi records highest number of good to moderate air quality days since 2018
1 week, 2 days ago
Delhi's air quality remains poor with AQI at 212 even as cold wave abates
Top News
1 week, 3 days ago
Air quality worsens again in Delhi, enters upper end of ‘poor’
1 week, 5 days ago
Delhi air quality returns to ‘poor’ category; minimum temperature at 8°C
2 weeks ago
Delhi's air quality again turns 'poor', likely to remain same for next two days
2 weeks ago
Delhi’s AQI in ‘poor’ category; min temperature to touch 6-degree mark from Tuesday
Top News
2 weeks, 1 day ago
Rain in Delhi improves air quality from 'very poor' to 'poor', AQI at 273
Top News
2 weeks, 1 day ago
Delhi’s air quality slips to ’very poor’ with AQI of 302, likely to worsen by Tuesday
2 weeks, 2 days ago
After Few Days Of 'Moderate' AQI, Delhi's Air Quality Deteriorates, Pollution Level Crosses 300
Trending News
2 weeks, 2 days ago
Delhi air quality remains 'poor', light rain today expected to intensify cold
2 weeks, 2 days ago
Slight relief as Delhi air quality remains ‘moderate’ for third day
2 weeks, 3 days ago
At 7.1°C, Delhi wakes up to coldest morning of season, air quality 'poor' again
2 weeks, 3 days ago
Delhi air pollution: National Capital records 'moderate' air quality
Trending News
2 weeks, 4 days ago
Delhi’s air quality remains moderate; slight rise in pollution levels
2 weeks, 4 days ago
Delhi pollution: Supreme Court allows GRAP 4 measures to be relaxed to GRAP Stage 2, says will monitor AQI
Trending News
2 weeks, 5 days ago
Delhi's AQI shows slight improvement in December amid air pollution concerns
Trending News
3 weeks ago
AQI stays ‘poor’ in Delhi; minimum temperature at 10.5°C
Top News
3 weeks ago
Smog Continues In Delhi Despite AQI Fall, Mumbai Sees Hazy Morning As Well
3 weeks ago
Delhi breathes easier as AQI in 'poor' category for three consecutive days
3 weeks ago
Delhi's air quality improves, AQI drops from ‘very poor’ to ‘poor’ for second consecutive day
Top News
3 weeks, 1 day ago
Delhi Air Pollution | Won't Permit GRAP-IV Relaxation Without Seeing Consistent Downward AQI Trend : Supreme Court
3 weeks, 1 day ago
At AQI 273, Delhi's air quality improves for second day, yet in ‘poor’ category
3 weeks, 1 day ago
Delhi snaps 32-day streak as AQI improves to ‘poor’ zone
3 weeks, 2 days ago
Mercury rises to 11.4°C as Delhi’s air quality remains ‘very poor’
Top News
3 weeks, 2 days ago
Delhi air pollution: Air quality continues to remain in ‘very poor’ category with AQI stands at 316
Top News
3 weeks, 2 days ago
Delhi-NCR air quality remains in ‘very poor’ category, residents raise health concerns
3 weeks, 2 days ago
Delhi's AQI drops to below 300 after a month
3 weeks, 2 days ago
Delhi air quality remains in 'very poor' category for third consecutive day
Top News
3 weeks, 3 days ago
No respite from pollution woes, air quality remains very poor in Delhi
Trending News
3 weeks, 4 days ago
Amid severe pollution, this Delhi home maintains AQI of 10-15 with 15,000 plants
3 weeks, 4 days ago
Delhi’s air quality hits 'very poor' category again, hazy conditions persist
3 weeks, 4 days ago

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