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More than 60% reduction in air pollution levels (PM10 and PM2.5 average values 24 hourly) in Delhi NCR after 11 days of lock down

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Dr KK Aggarwal and Dr Anil Kumar (Heart Care Foundation of India)    05 April 2020

During complete lock down, the values of PM10 and PM2.5 in Delhi-NCR are significantly below the standards. Air quality Index (AQI) is in the good/satisfactory range.

About a million people are affected worldwide due to COVID-19 pandemic. As a preventive measure, on the appeal of Hon’ble Prime Minister of India, Janta Curfew was imposed on 22-03-2020 and entire India has been locked down for 21 days starting from 25-03-2020.

In Delhi, lock down is in effect from 23-03-2020 and there has been almost no movement of people and vehicles on roads in last 11 days (only vehicles related to essential services are moving on roads). This has resulted in improved air quality in Delhi. In Delhi, prominent pollutants are PM10 and PM2.5. As per Central Control Room for Air quality Management – Delhi-NCR, the average values (24 hourly) of PM10 and PM2.5 in Delhi-NCR  from 21-03-2020 to 02-04-2020 are as follows:

Date : 21-03-2020 ( the day before Janta curfew):

Time

PM10 (Standard – 100 microgram per metre cube )

PM2.5 (Standard – 60 microgram per metre cube )

6:00 AM

203.4

87.0

12 Noon

188.4

79.0

6:00 PM

187.4

79.5

11: 00 PM

184.0

80.4

 Date : 22-03-2020 ( the day of Janta curfew):

Time

PM10 (Standard – 100 microgram per metre cube )

PM2.5 (Standard – 60 microgram per metre cube )

6:00 AM

182.9

86.8

12 Noon

177.3

88.8

6:00 PM

159.6

82.7

11: 00 PM

129.6

72.6

Date : 23-03-2020 (starting  day of Lock down):

Time

PM10 (Standard – 100 microgram per metre cube )

PM2.5 (Standard – 60 microgram per metre cube )

6:00 AM

104.8

58.9

12 Noon

98.5

54.2

6:00 PM

96.7

51.7

11: 00 PM

105.1

52.7

 Date : 24-03-2020 ( Lock down continued):

Time

PM10 (Standard – 100 microgram per metre cube )

PM2.5 (Standard – 60 microgram per metre cube )

6:00 AM

115.9

58.5

12 Noon

118.1

58.6

6:00 PM

127.7

62.1

11: 00 PM

109.5

55.1

 Date : 25-03-2020 (Lock down continued):

Time

PM10 (Standard – 100 microgram per metre cube )

PM2.5 (Standard – 60 microgram per metre cube )

6:00 AM

94.6

45.5

12 Noon

81.2

39.4

6:00 PM

67.8

34.7

11: 00 PM

72.5

37.3

 Date : 26-03-2020 (Lock down continued):

Time

PM10 (Standard – 100 microgram per metre cube )

PM2.5 (Standard – 60 microgram per metre cube )

6:00 AM

75.8

40.9

12 Noon

75.0

39.5

6:00 PM

73.2

38.4

11:00PM

75.3

39.1

Date : 27-03-2020 (Lock down continued):

Time

PM10 (Standard – 100 microgram per metre cube )

PM2.5 (Standard – 60 microgram per metre cube )

6:00 AM

 69.6

33.8

12 Noon

63.3

31.0

6:00 PM

58.0

29.4

11:00PM

44.2

23.8

Date : 28-03-2020 (Lock down continued):

Time

PM10 (Standard – 100 microgram per metre cube )

PM2.5 (Standard – 60 microgram per metre cube )

6:00 AM

34.4

19,6

12 Noon

31.1

18.0

6:00 PM

31.3

17.5

11:00PM

36.1

20.8

 Date : 29-03-2020 (Lock down continued):

Time

PM10 (Standard – 100 microgram per metre cube )

PM2.5 (Standard – 60 microgram per metre cube )

6:00 AM

42.3

22.7

12 Noon

47.9

23.4

6:00 PM

52.9

24.2

11:00PM

55.0

25.2

Date : 30-03-2020 (Lock down continued):

Time

PM10 (Standard – 100 microgram per metre cube )

PM2.5 (Standard – 60 microgram per metre cube )

6:00 AM

58.7

27.2

12 Noon

62.2

30.4

6:00 PM

61.9

30.9

11:00PM

66.0

32.6

Date : 31-03-2020 (Lock down continued):

Time

PM10 (Standard – 100 microgram per metre cube )

PM2.5 (Standard – 60 microgram per metre cube )

6:00 AM

70.2

35.8

12 Noon

66.7

33.6

6:00 PM

68.2

35.2

11:00PM

66.7

33.1

Date : 01-04-2020 (Lock down continued):

Time

PM10 (Standard –100 microgram per metre cube )

PM2.5 (Standard – 60 microgram per metre cube )

6:00 AM

61.9

27.2

12 Noon

67.9

29.4

6:00 PM

70.0

30.0

11:00PM

66.8

30.7

Date: 02-04-2020 (Lock down continued):

Time

PM10 (Standard – 100 microgram per metre cube )

PM2.5 (Standard – 60 microgram per metre cube )

6:00 AM

67.0

32.1

12 Noon

62.6

28.8

6:00 PM

60.0

26.9

11:00PM

61.6

26.8

 Comparison of PM10 average values (24 hourly) before and after lockdown in Delhi- NCR 

Time

PM10 (Standard – 100 microgram per metre cube ) on 21-03-2020 ( the day before Janta curfew):

 PM10 (Standard – 100 microgram per metre cube ) on 02-04-2020 ( 11th day of lock down in Delhi):

% reduction in PM10 values   after lockdown in Delhi- NCR

6:00 AM

203.4

67.0

67.06

12 Noon

188.4

62.6

66.77

6:00 PM

187.4

60.0

67.98

11:00 PM

184.0

61.6

66.52

 

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