Its the system that prevents evaporative emissions from escaping during refueling and during operation. It prevents volatile organic chemicals (VOCs) from escaping to the atmosphere. VOCs and nitrogen oxides (NOx) - also emitted from the exhaust - react in the presence of sunlight to form photochemical ozone smog. This is the air pollution that infests places like Los Angeles, Houston, New York, etc.
It is very important that these systems operate well for human health and welfare, especially that of our children.
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