Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.
[Back to Top] The Federal standard for ground-level ozone is 0.075 parts per million (ppm), averaged over an 8-hour period. This is often referred to as the “8-hour standard” and replaces an older “1-hour standard” of 0.125 ppm. Levels of 0.076 ppm and above exceed the Federal ground-level ozone standard.
