Select the search type
 
  • Site
  • Web
Search

Air Quality Forecast

Results of air quality predictions in Egypt for three days, according to the early warning system.

Select Day Select Area


   Good    Fair    Poor

For more information, click on the forecasts (color dots) on the map.

Summary of Air Quality Forecast for Day: 12/15/2017



Area Day 1 Day 2 Day 3
Great_Cairo  3  3  1.3
Delta  2.7  2.2  2.1
North_Egypt  2.9  1.9  2.1
Canal  4.1  2.5  2.6
Sinai  2.4  1.6  1.4
Upper_egypt  3.5  2.4  1.5

About Forecast

Impact of Weather Conditions

Classification Ventilation Index
(Forecast - vi)
Color
Poor - سيئ 0 - 3.3   
Fair - متوسط 3.4 - 5.4   
Good - جيد 5.5 - 10   


Definitions

Ventilation Index VI:
An indicator from it we can know the ability of weather conditions to disperse or concentrate the pollutants. It is divided into:
  • High in green: which means good ventilation and helps to disperse pollutants.
  • Medium is yellow: which means Partial ventilation and helps to partially disperse the pollutants.
  • Low is red: which means that ventilation is bad and helps to concentrate pollutants

Boundary Layer Height HPBL:
The boundary layer is that part of the atmosphere near the Earth's surface. Its height (HPBL) ranges from several meters to several kilometers. This layer is characterized by Turbulence due to the distribution of heat on the surface of the Earth by heating from the sun and ground radiation or as a result of upward movement of air. All this play an important role in the distribution of pollutants. When this layer is high this mean that weather conditions help to disperse pollutants. And when this layer is low this mean that weather conditions help to concentrate the pollutants to rise above the acceptable or allowable limit.

Stable weather:
It is said that the weather is stable when the distributions of temperature with height resist any upward movement of air. In this case there is no ascending or descending air currents. When the air is humid, the stability helps to fog formation at the surface of the earth, but if the air is dry, the stability help on concentration of dust, sand, and smoke near the Earth's surface layer. Then it is clear that stable weather works on decreasing the horizontal visibility near the earth's surface.

Unstable weather:
It is said that the weather is unstable when the temperature distributions with height help the upward movement of air. In this case there is ascending or descending air currents. When the air is humid, the instability helps to form low and medium clouds and thunderstorms, but if the air is dry, the air currents caused occurrence of air bumps and they help to raise sand and dust, according to the nature of the ground.

Period of increasing concentrations (critical period):
It is the period when weather conditions help to concentrate the pollutants to rise above the acceptable or allowable limit.

Thermal inversion (Temperature inversion layers):
They are areas where the normal decrease in air temperature with increasing altitude is reversed and air above the ground is warmer than the air below it. Inversion layers can occur anywhere from close to ground level up to thousands of feet into the atmosphere.
Inversion layers are significant to meteorology because they block atmospheric flow which causes the air over an area experiencing an inversion to become stable. This can then result in various types of weather patterns. More importantly though, areas with heavy pollution are prone to unhealthy air and an increase in smog when an inversion is present because they trap pollutants at ground level instead of circulating them away.

atmosphere

Contacts

  • Chemist. Moustafa Mohamed Mourad - Head of central department of air quality and noise
  • Eng. Mohamed Saad Abd Alla - Early Warning Management Director
  • Dr. Samir Zakria Ahmed Shora - Air quality Modeling

Data Source

Early Warning System Report for Egypt Air Pollutants
Air Quality Department
Central Department of Air Quality and Noise Protection
Environmental Quality Sector