The annual average of nitrogen dioxide (NO2) concentration in the city has shown a marginal increase from 2011, with the concentration being 73.55 g/m3 last year, the latest economic survey of Delhi said today.
"No significant variation was observed in the annual average value of Sulphur Dioxide (SO2) from 2011 to 2017. The values monitored were always within the prescribed limits of 50g/m3 at all stations. The minimum value was observed at Mandir Marg and the maximum at R K Puram stations," the survey said.
The concentration of PM10 varied from 196 g/m3 to 410 g/m3 at different stations. The minimum value was observed at Mandir Marg and the maximum at Anand Vihar.
Concentration of PM2.5 varied from 108 g/m3 to 170 g/m3 at different stations. The minimum was observed at Mandir Marg and maximum at Civil Lines, it added.
"The minimum value (of NO2 concentration) was observed at Mandir Marg and maximum at Anand Vihar. The higher values may be due to high vehicular density in the area. At all the monitoring locations, annual average exceeded the prescribed standard of 40 g/m3," the survey said.
The tree cover area of Delhi increased from 22 sq km in 1993 to 305.41 sq km in 2017. The percentage of forest and tree cover area to the total area of Delhi has increased manifold from a mere 1.48 per cent in 1993 to 20.59 per cent in 2017, it added.
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