New Delhi: Air pollution declined in the
capital this Diwali as compared to last year but noise level
rose marginally due to bursting of more loud crackers.
Data released by Delhi Government and Central Pollution
Control Board (CPCB) board showed that air pollution,
particularly levels of pollutants in the air, was much lower
this Diwali compared to that last year.
The CPCB had monitored ambient air at seven locations
while ambient noise monitoring was undertaken at nine
locations across the city. The Environment Department of Delhi
Government had also monitored air pollution in five locations.
Data obtained from eleven on-line stations were also
taken into account while finalising the findings.
The CPCB, in a statement, said noise level during Diwali
yesterday showed a slight increase at three locations,
decreased at three, while there was no change at remaining
three locations as compared to noise level during the festival
of light on November 5 last year.
Levels of `particulate matter and respirable suspended
particulate matter (RSPM)` showed substantial decrease this
time as compared to last year.
"The levels of particulate matter in the air have shown
decreasing trend at all the locations yesterday as compared to
2010. RSPM values yesterday ranged between 416 and 635
microgram per cubic metre as compared to 704 and 1350
microgram per cubic metre during Diwali last year."
Delhi Environment Secretary Keshav Chandra said that
sustained campaign by the city government and an appeal by
Chief Minister Sheila Dikshit to celebrate a pollution-free
Diwali led to the decline in pollution level.
"The Chief Minister motivated the citizens, youth and
students to make a campaign against fire crackers a grand
success, which resulted in substantial decrease in air
pollution across Delhi," he said.
The CPCB said ambient noise level monitoring was carried
out at Lajpat Nagar, Mayur Vihar (Phase-II), Pitampura,
Kamla Nagar, Dilshad Garden, East Arjun Nagar, Ansari Nagar,
Connaught Place and ITO between 6 PM and 12 AM.
Air pollutant levels were found to be lower as compared
to 2010 Diwali and CPCB said the lower pollution could be due
to favourable meteorological conditions.
The avarage temperature yesterday was 26.4 degree Celsius
as compared to average temperature of 21.2 degree C on
November 05, 2010. It could also be due to increase in wind
speed to 1.1 m/sec yesterday from 0.9 m/sec in 2010, said
Delhi government monitored air quality at IGI Airport,
Civil Lines, Mandir Marg, R K Puram and Punjabi Bagh.
Chandra said the concentration of the pollutants has
shown a decline this year as compared to last year.
"This may be attributed to concerted and sustained
anti-fire cracker campaign and active participation of
citizens of Delhi in favour of the campaign. There has been
far less concentration of the pollutants as measured and
monitored scientifically," he said.
He said carbon monoxide level yesterday ranged from 1.2
mg per cubic metre to 2.05 mg per cubic metre against last
year`s range of 0.87 to 9.75 mg per cubic metre. The maximum
carbon monoxide level was recorded at Punjabi Bagh.
On levels of nitrogen oxide (NO2), he said the average
concentration of NO2 varied from 59.64 - 133.4 micro gram per
cubic metre and levels of NO2 at all four locations were lower
than the levels found during last year`s Diwali.
He said the levels of sulphur dioxide yesterday varied
from 34.58 to 42.9 micro grams per cubic metre against last
year`s range of 26.0 to 73.5 micro grams per cubic metre.
Chandra said Delhiites were able to keep the pollution
level lower than last year.