_____ refer to six natural substances that in large quantities cause the degradation of air quality.

Question

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Criteria pollutants refer to six natural substances that in large quantities cause the degradation of air quality. These pollutants include carbon monoxide, lead, nitrogen dioxide, ground-level ozone, particulate matter, and sulfur dioxide. Point source effluents and hazardous air pollutants are terms used to describe specific sources of air pollution, while greenhouse gases are a broader category of gases that contribute to climate change.

_____ Refer to Six Natural Substances That in Large Quantities