Air Quality Management of Particulate Matter Emitted from Vehicular Sources in Delhi. by P. Goyal, Neeru Jaiswal, Rashmi Mittal Centre for Atmospheric Sciences, Indian Institute of Technology, Delhi. Overview of the Presentation. Introduction Objective of the study
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P. Goyal, Neeru Jaiswal, Rashmi Mittal
Centre for Atmospheric Sciences,
Indian Institute of Technology, Delhi
process, auto exhaust and domestic sources.
million in 2004.
Air Quality Management of PM in Delhi through:
moderate wind conditions.
next 10 years.
The concentration of PM due to line source in low winds (u< 1 m/sec) conditions is
and the concentration for moderate winds (u> 1 m/sec) is
C = concentration (mg/m3) ; Q = Source strength (mg/sec) ;
U = Wind speed (m/sec) ;
(x’, y’, z’) = location of source (m) ; (x, y, z) = location of receptor (m) ;
(sx, sy,sz) = dispersion parameters (m) in x, y, z directions respectively.
over an area of Delhi City
(26Km × 30Km) has been
approximated by number of
straight lines and each of
these straight line is
considered as a separate source.
road has been obtained
is estimated from the
contributions of all the source
located within that grid.
Emission rate of PM has been estimated in each grid on hourly basis by using secondary data of vehicular traffic and apportioned according to the following methods:
E = Emission rate (gm/sec)
i = Index, varies over six categories of vehicles.
Ni = Number of registered vehicles in i th category
TDi =Travel demand for vehicular category i (km/day)
VKT= Vehicle Kilometer traveled (Km)
ei = Emission factor (g/km) for the pollutant of the vehicular category i
Vehicles are categorized into 6 vehicle category: Cars, Two wheeler, Three wheeler, Buses, Taxi, and Goods vehicles.
highways, nearly at 36 places in Delhi.
pollutant for each vehicle group.
of the grids of the study area
residential roads is in the ratio of 43: 33:24 respectively.
Hourly variation of emission rates of PM has been determined by different methods, which reveals that emission of PM from different methods are well in agreement with observed values.
An emission inventory of vehicles has been prepared over the map of Delhi, which gives emission rate of PM in each grid.
PM Emission at ITO
Forecasting of PM emissions, on the basis of present emission scenario, for future years (2005-2014) is showing slightly increasing values.
shows two peaks during the day hours. First peak occurs
between 9 AM to 11 AM and second is between 5 to 7 PM.
of PM during the day hours shows that model is always over
predicting but remains within a factor of two.
Temporal variation of PM concentration and Source Strength
4-hourly averaged concentration at Nizzamuddin monitoring station
Isopleths of PM reflects that hotspots in Delhi at ITO, Shivaji Stadium, Cannaught Place, Dhaula Kuan and Laxmi Nagar have maximum values of PM ranging from 300-600 mg/m3 which are beyond NAAQS (200 mg/m3).
Spatial variation of PM concentration in Delhi (January, 2004).
traffic condition of Delhi can be used for air quality impact
assessment due to vehicular traffic in other cities like Delhi.
used for emission control as a first step for air quality
making the future strategy of air quality management.
are beyond the NAAQS at most of the places in Delhi.
used for emission control and regulatory purposes.
Thanks Vehicular Sources in Delhi