•
•
Troposphere
Stratosphere
• Ozone layer is a thin, fragile
shield that contains relatively
high concentrations of ozone.
• It shields the entire Earth
from much of the harmful UV
radiation that comes from the
sun
• Damage in the ozone layer will
naturally mean the entry of
harmful
rays
in
to
the
atmosphere.
• In the 1970s, the scientists
discovered that the ozone
layer is being depleted.
•
seasons
•
weather conditions, and
•
solar cycles
Ozone layer is being
destroyed by a group of
manufactured chemicals that
are called ODS or OzoneDepleting Substances.
The main ODS are the following:
• Chlorofluorocarbons (CFC 11, CFC 12, CFC
13)
• Methyl bromide (CH3Br)
• Halons (halon-1211, halon-1301, halon-2402)
• Carbon tetrachloride (CCI4)
• Hydrochloroluorocarbons (HCFC 22 and HCFC
123)
The Principal Steps in Stratospheric Ozone
Depletion Caused by Humans
Emissions
Accumulation
Transportation
Removal
Chemical
Reaction
Conversion
The Process of ODS Reaching the Atmosphere
The effect of ozone depletion
is the increased UV-B radiation
reaching Earth’s surface.
Effects on Humans
• Sunburn
•Sun-damaged skin
•Cataracts
•Snow blindness
•Skin cancer
• Reduced effectiveness
immune system
• Respiratory
heart problems
illness
of
and
Effects on the Environment
• Global warming
• Climate change
• Crop and forest damage
• Infections and skin diseases
animals
• Less ocean plankton
• Less fish harvest
on
Marine
Ecosystems
Humans
Air Quality
Terrestrial
Ecosystems
Materials
Mitigations
When
an
ozone
hole
was
discovered, several countries unite to
prevent the continuous depletion of
the ozone layer by implementing
policies
and
other
preventive
measures.
•
The
Montreal
Protocol
on
Substances that Deplete the Ozone
Layer
Philippines’ Laws and Policies
• Republic Act 6969 or the Toxic
Substances and Hazardous and
Nuclear Wastes Control Act.
•
Republic Act 8749 or the
Philippine Clean Air Act of 1999
• Republic Act 9003 or the Ecological
Solid Waste Management Act.
• Presidential Decree 1144
Davao City has also implemented
mitigating
measures.
The
Local
Government implemented the Davao
City
Ecological
Solid
Waste
Management Ordinance 2009 (Section
7, Article 5 of the Ordinance 0361
series of 2010)
- that provides the use of
recyclable, biodegradable or reusable
containers as food and beverage
parcels started 28 June 2012.
Be
informed
Be
reminded
Understand
Sustainable
development
Follow
Know our
responsibilities
Educate
ourselves