An Investigation of the Urban Air Pollution Regarding Mixing Depth in Tehran Metropolis Using the AERMOD Model
Seyed Reza Miralizadeh Fard, Shahrzadkhoramnejadian, Yousef Rashidi
1553
ABSTRACT
Air
stability results in a condition in which the vertical movements of the air mix
pollutants with other vertical layers. The vertical distance between the surface of the earth and the height to which transitional
movements can reach is called the mixing depth. This study aimed to investigate
the relationship between the rate of the mixing depth and pollutants measured
by monitoring stations. The emission rate of O3, SO2, PM10, NO2, CO and PM2.5
pollutants in different air quality stations located in the Pounak Area in
Tehran were measured based on hourly, daily and seasonal information.
Investigations revealed that six pollutants were dispersed in the area.The data
of these pollutants with their mixing depth were also investigated. Then, the
hourly mean of the concentration of air pollutants in the Pounak area was
measured based on the gathered information from air quality stations in terms
of the height of convection boundarylayer and height of mechanical (depth)
boundarylayer. By releasing
14 hours at 148 ppm, you will be able to access more than 150 ppm at 145 ppm,
you can use 150 ppm to control the guide, or carbon monoxide at 35 ppm. And use
12 ppm. Nitrogen in the range of 200 ppm, the allowable limit for pressure
control on 196 ppm on your site is able to use 40 ppm, you can have high
quality at 200 ppm per minute and can use it at the level of 150 ppm. 35 ppm,
which indicates that it can be published and allowed to be published.The
results of the study revealed that the height of urbane mixing depthascends in
tandem with air temperature changes. Moreover, synoptic conditions can stop the
movement and convection of the mass of the boundarylayer air.. In terms of
meteorological conditions, wind speed, atmospheric stability and the mixing layer
depth were found to be the most important factors of emission
Keywords:Mixing depth, climate conditions, air pollutants, the height of
mixing depth, urbane air quality
ABSTRACT
Air
stability results in a condition in which the vertical movements of the air mix
pollutants with other vertical layers. The vertical distance between the surface of the earth and the height to which transitional
movements can reach is called the mixing depth. This study aimed to investigate
the relationship between the rate of the mixing depth and pollutants measured
by monitoring stations. The emission rate of O3, SO2, PM10, NO2, CO and PM2.5
pollutants in different air quality stations located in the Pounak Area in
Tehran were measured based on hourly, daily and seasonal information.
Investigations revealed that six pollutants were dispersed in the area.The data
of these pollutants with their mixing depth were also investigated. Then, the
hourly mean of the concentration of air pollutants in the Pounak area was
measured based on the gathered information from air quality stations in terms
of the height of convection boundarylayer and height of mechanical (depth)
boundarylayer. By releasing
14 hours at 148 ppm, you will be able to access more than 150 ppm at 145 ppm,
you can use 150 ppm to control the guide, or carbon monoxide at 35 ppm. And use
12 ppm. Nitrogen in the range of 200 ppm, the allowable limit for pressure
control on 196 ppm on your site is able to use 40 ppm, you can have high
quality at 200 ppm per minute and can use it at the level of 150 ppm. 35 ppm,
which indicates that it can be published and allowed to be published.The
results of the study revealed that the height of urbane mixing depthascends in
tandem with air temperature changes. Moreover, synoptic conditions can stop the
movement and convection of the mass of the boundarylayer air.. In terms of
meteorological conditions, wind speed, atmospheric stability and the mixing layer
depth were found to be the most important factors of emission
Keywords:Mixing depth, climate conditions, air pollutants, the height of
mixing depth, urbane air quality