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Starting in 1993 mainly because of the wide use of bad quality petrol unallowable concentration of formaldehyde and benzene were found in the air of Yerevan.

Because of changes in the type of heating system in Armenia the level of indoor air pollution has increased. At the same time breathing pathologies, contributing to a rise in death rate, lung’s cancer , still births, infant mortality and bronchial asthma have increased.

The sickness rate and the death-rate of breathing pathologies have also diminished. The most expressive the above mentioned changes have been manifested in Yerevan.