unit 7
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Unit 7 The quality of our air. Unit 7. The Quality of Our Air. Unit 7 The quality of our air. How clean is the air?. Air quality and pollutants Polluted air contains a lot of dust particles and acidic gases. They are harmful to our health. Unit 7 The quality of our air. - PowerPoint PPT PresentationTRANSCRIPT
Unit 7
The Quality of Our AirThe Quality of Our Air
Unit 7 The quality of our air
How clean is the air?How clean is the air?Air quality and pollutantsAir quality and pollutants
Polluted air contains a lot of dust particles and acidic gases.
They are harmful to our health.
Unit 7 The quality of our air
What is ‘air pollution index’?What is ‘air pollution index’?Unit 7 The quality of our air
The Environmental Protection Department operates a network of air quality monitoring stations to measure the air quality of various districts.
Internet
Air quality monitoring station
Tai PoYuen Long
Tsuen Wan
Kwai Chung
Shamshuipo Mongkok
Central/ Western
Shatin
Central Eastern
Causeway Bay
Kwun Tong
km
Ambient Station
Roadside Station
N
The location of air quality monitoring stationsThe location of air quality monitoring stations
Unit 7 The quality of our air
Ambient Station in Tsuen Wan (Source: EPD)
Roadside Station in Causeway Bay (Source: EPD)
What is ‘air pollution index’?What is ‘air pollution index’?Unit 7 The quality of our air
Smoky vehicles will have to undergo tests
The department also sets up roadside monitoring stations to find out the level of pollution in busy streets and roads.
The department also sets up roadside monitoring stations to find out the level of pollution in busy streets and roads.
The lorry took part in a trial to test heavy vehicles using the treadmill.
Smoky vehicles
What is ‘air pollution index’?What is ‘air pollution index’?Unit 7 The quality of our air
The department publishes an air pollution index each day.
The department publishes an air pollution index each day.The index has a range of 0 to 500 and is divided into five bands.
The index has a range of 0 to 500 and is divided into five bands.
The air pollution index increases as the air quality gets poorer.
The air pollution index increases as the air quality gets poorer.
An index under 50 is regarded as good while that over 100 is regarded as unhealthy.
An index under 50 is regarded as good while that over 100 is regarded as unhealthy.
The index gives advice to the public about what people should do when the air reaches an unhealthy level.
The index gives advice to the public about what people should do when the air reaches an unhealthy level.
What is ‘air pollution index’?What is ‘air pollution index’?Unit 7 The quality of our air
Severe
Very high
High Medium
Low
Air Pollution Air Pollution LevelLevel
APIAPI
Reduce physical and outdoor activities
Persons with heart or respiratory illness should reduce physical and outdoor
activities.
No immediate response action required.No action required.No action required.
Action to TakeAction to Take
What is ‘air pollution index’? What is ‘air pollution index’? Air pollution index are calculated by comparing the measured
concentrations of the major air pollutants with their
respective health related Air Quality Objectives (AQOs)
established under the Air Pollution Control Ordinance.
These pollutants are nitrogen dioxide, sulphur dioxide, ozone,
carbon monoxide and respirable suspended particulates.
APIs for each of these five pollutants are calculated and the
highest API number is reported as the API of that hour.
Unit 7 The quality of our air
Monthly air quality of 1996Monthly air quality of 1996
Unit 7 The quality of our air
Good
Moderate
Unhealthy
Month
%
Air quality
DiscussionDiscussionUnit 7 The quality of our air
Good
Moderate
Unhealthy
Month
%
Air quality
Do you know why air quality Do you know why air quality
is often good in summer but is often good in summer but
getting worse in winter?getting worse in winter?
Terms to learnTerms to learn
ConventionConvention ( 會議會議 )--a meeting held to discuss a particular matter.
Greenhouse gasesGreenhouse gases ( 溫室氣體溫室氣體 )--gases such as carbon dioxide which trap the sun’s heat and cause the world temperature to rise.
Air pollution indexAir pollution index ( 空氣污染指數空氣污染指數 )--an indicator published by the Environmental Protection Department to show air quality.
Unit 7 The quality of our air