Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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in human health protection, e.g. against extreme weather > Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Of 1 combined children, 0 exist in both systems.

1 codes are CPC-only extensions.

Note: 1 CPC extensions are marked as secondary classification only.

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