NEW DELHI Residents inIndias northern states woke up to another day ofpoor air qualityon Tuesday, as a layer of dense fog shrouded most of the region, andpollution in the capital, Delhi,remained severe.
India battles air pollution every winter as cold, heavy air traps dust, emissions and smoke from farm fires started illegally in the adjoining, farming states of Punjab and Haryana.
Theair quality index(AQI) touched a peak of 491 in Delhi on Monday, forcing the government to introduce restrictions on vehicle movement and construction activities, and schools to conduct classes online.
On Tuesday, Delhi s 24-hour AQI reading was at 488 on a scale of 500, India s Central Pollution Control Board (CPCB) said, and at least five stations in the capital reported an AQI of 500.
Visibility dropped to zero meters in Uttar Pradesh s Agra, which lies southeast of Delhi. TheTaj Mahal, India s famed monument of love, has been obscured by toxic smog for nearly a week.
CPCB defines an AQI reading of 0-50 as good and above 401 as severe, which it says is a risk to healthy people and seriously impacts those with existing diseases.
Swiss group IQAir ranked New Delhi as theworld s most polluted citywith air quality at a hazardous 489, although that was a significant improvement from Monday s 1,081 reading.
Experts say the scores vary because of a difference in the scale countries adopt to convert pollutant concentrations into AQI, and so the same quantity of a specific pollutant may be translated as different AQI scores in different countries.
India s weather department said a shift in the fog layer toward the northern state of Uttar Pradesh had helped improve visibility over Delhi.
The strict measures to mitigate the impact of high pollution have hurt production at more than 3.4 million micro, small and medium enterprises in the nearby states of Punjab, Haryana and Delhi, local media reported.
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