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The air pollution pump is only for emissions. It's job is to bring air into the exhuast to get the catalytic up to temp faster.
Secondary air injection (commonly known as air injection, or colloquially smog pump) is a vehicle emissions control strategy introduced in1966, wherein fresh air is injected into the exhaust stream to allow for a fuller combustion of exhaust gases.
"The smog pump - or air pump - adds air (oxygen) to the exhaust gases at the exhaust manifold, and before the catalytic converter. This continues the burning process, allowing the catalytic converter to consume (burn) unburned and partially burned fuel products. This reduces the amount of hydrocarbons emitted out the exhaust. The burning produces more oxides of carbon and nitrogen than unburned fuel, simply because it is burnt. "
