• Air pollution is the a condition in which the quality of air is degraded due to the presence of harmful substances particulate matter, and biologically agents
• It’s more dangerous than the outdoor pollution, because we do everything in enclosed environments where air circulation may be restricted.• There are many sources of indoor air pollution: tabacco smoke, cooking and heating appliances, and vapors from building materials.
Outdoor air pollution• Outdoor air pollution is pollution outside a house, buildings etc . There are many sources of air pollution like cars, factories etc.
POINT SOURCES• THOSE WHICH ARE READILY IDENTIFIED AND ARE STATIONARY SUCH AS FACTORY SMOKESTACKS. THEY DIRECTLY EMMIT TO THE ATMOSPHERE GASES WHICH CONTRIBUTE TO THE POOR QUALITY OF AIR
NONPOINT SOURCES• THOSE WHICH ARE NOT EASILY IDENTIFIED AS THEY ARE DIFFUSED AND MAY NOT BE CONSTANTLY EMITTING POLLUTANTS. EXAMPLES OF THESE ARE URBAN RUNOFF WHICH INCLUDES VOLATILE AND HAZARDOUS SUBSTANCES, AND MOBILE SOURCES SUCH AS CARS.
THERMAL INVERSION• IF THE FACTORY IS SOROUNDED BY MOUNTAINS , OR EVEN BY TALL BUILDINGS, THEN THE SMOKE IT RELEASES COULD NOT DIFFUSE OR DISPERSE FAST. COLL AIR IS NOT ABLE TO RISE BECAUSE IT IS TRAPPED BY WARM AIR. IT SETTLES IN THE PLACE AND HOLDS MORE POLLUTANTS FROM INDUSTRIES AND OTHER SOURCEES.
THE EXTENT AND DEGREE OF AIR POLLUTION IN AN AREA DEPENDS ON SEVERAL FACTORS:• SOURCE OF POLLUTION• RATE OF EMISSION• WIND• TOPOGRAGHY / LOCATION
SOURCE OF POLLUTION• IF THE SOURCES OF AIR POLLUTION ARE MANY THE DEGREE OF AIR POLLUTION IS ALSO HIGH
RATE OF EMISSION• THIS IS THE TOTAL AMOUNT OF EMITTED GASSES BY POINT AND NONPOINT SOURCES. IF THIS IS HIGH THE DEGREE OF AIR POLLUTION IS ALSO HIGH
WIND• WIND DILUTES AIR POLLUTANTS AS ITS DISPERSE THEM. THE STRONGER THE DISPERSAL BY WIND, THE LOWER IS THE AIR POLLUTION
TOPOGRAPHY / LOCATION• IF THE AREA IS SORROUNDED BY MOUNTAINS OR TALL BUILDINGS, THE DEGREE OF AIR POLLUTION IS HIGH BEAUSE OF THERMAL INVERSION