proposed integrated complex for delhi judicial academy

Rapid Environmental Impact Assessment (REIA) Study for Proposed Integrated Complex for Delhi Judicial Academy,
National Law School, and National Institute for Mediation & Conciliation at Dwarka, New Delhi
The existing Ambient Air Quality (AAQ) status has been monitored for SPM, RPM, SO 2 ,
NOX and CO representing the criteria pollutants. SPM & RPM at each station has been monitored
on 24 hourly basis and CO on 8 hourly basis. Pre calibrated high volume samplers have been used
for monitoring of the existing AAQ status. The Respirable particulate matter (RPM) was separated
through cyclone and measured by gravimetric method similar to SPM. SO 2 and NOx were analyzed
by Colorimetric method.
Methodologies adopted for sampling and analysis were, as per the approved methods of Central
Pollution Control Board (CPCB). Maximum, minimum, average and percentile values have been
computed from the raw data collected at all individual sampling stations to represent the ambient
air quality status of the study area.
4.5.3 Analysis of Baseline Concentrations
The details about sampling locations identified during study period are presented in Table 4.4. The
locations have been identified keeping in view predominant wind direction prevailing during study
period, sensitivity, human settlement, construction activities, traffic concentration, and others.
The results of ambient air quality within the study area monitored between March and May 2006
are presented in Table 4.5. And percentile distribution of SPM, RPM, SO 2 and NOx are presented
in Table 4.6. The average concentration of SPM, RPM, SO 2 , CO, and NOx monitored during the
study period were found to be less than NAAQS prescribed for residential areas at most of the
locations.
• Suspended Particulate Matter - SPM
Suspended particulate matter monitored in the study area showed 98 th percentile values in the
range of 172 – 195 µg/m 3 . The highest value of SPM level (215 µg/m 3 ) was observed at AAQ4
station. The average SPM concentration at all the four locations is well within the limit
prescribed for residential areas.
• Respirable Particulate Matter - RPM
RPM values monitored at 4 locations showed 98 th percentile values in the range of 60 – 76
µg/m 3 . Highest value of 81 µg/m 3 was recorded at AAQ3 station. However, the average values
at most of the locations are well within the limits for residential areas.
• Sulphur dioxide - SO 2
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