![What is the primary standard level for carbon monoxide for assuring air quality?](https://www.gkseries.com/blog/wp-content/uploads/2021/12/What-is-the-primary-standard-level-for-carbon-monoxide-for-assuring-air-quality.png)
Q. What is the primary standard level for carbon monoxide for assuring air quality?
- 10ppm
- 90ppm
- 1ppm
- 9ppm
Answer: 9ppm
Answer: 9ppm
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