What are the current EPA air quality standards for ozone?
What are the current EPA air quality standards for ozone?
On October 1, 2015, the U.S. EPA lowered the national eight-hour standard from 0.075 ppm to 0.070 ppm….Categories.
| 1-Hour Average | 8-Hour Average | |
|---|---|---|
| National Ambient Air Quality Standard | — | 0.070 ppm* |
| California Ambient Air Quality Standard | 0.09 ppm* | 0.070 ppm* |
What is the general trend in ozone concentration?
Decreasing 95th percentile ozone trends are generally in the range of 1–2 ppb/yr (15–30 ppb over the 15 year period) at urban, suburban, and rural monitoring sites in the summer and 0.5–1 ppb/yr in the winter, which demonstrates the substantial reduction of high ozone events that has been achieved in the U.S. …
Does the ozone layer affect air quality?
Exposure to high ozone levels can cause sore throat, coughing, lung inflammation, and permanent lung damage. Ozone pollution affects our lungs, making it difficult to breathe. Children, the elderly, and people with ongoing illnesses are more vulnerable to air pollution than other groups.
What is the current status of ground level ozone?
For instance, the current eight-hour average National Ambient Air Quality Standard for ozone in the United States is 70 parts per billion, and the current World Health Organization guideline is approximately 51 parts per billion.
Does the EPA regulate ozone?
The Clean Air Act requires EPA to set national ambient air quality standards (NAAQS) for ozone and five other pollutants considered harmful to public health and the environment (the other pollutants are particulate matter, nitrogen oxides, carbon monoxide, sulfur dioxide and lead).
What is ozone EPA?
Ozone (O3) is a highly reactive gas composed of three oxygen atoms. It is both a natural and a man-made product that occurs in the Earth’s upper atmosphere. (the stratosphere) and lower atmosphere (the troposphere). Depending on where it is in the atmosphere, ozone affects life on Earth in either good or bad ways.
How is ozone measured by EPA?
An ozone analyzer measures the real-time ozone concentration in the air. Ambient air is drawn through a sampler inlet from the top of a 10-meter tipping tower by a pump.
What is the theme of ozone Day 2021?
Montreal Protocol
The theme for 2021 for International Day for the Preservation of the Ozone Layer is ‘Montreal Protocol -‘Keeping us, our food and vaccines cool.
What is ozone air quality?
Ozone is a gas composed of three atoms of oxygen. Ozone occurs both in the Earth’s upper atmosphere and at ground level. Ozone at ground level is a harmful air pollutant, because of its effects on people and the environment, and it is the main ingredient in “smog.” Learn more about air emission sources.
Why does California have high ozone levels?
California, and more specifically the Los Angeles region, is especially susceptible to high ozone levels. “So when the ozone levels go up, it is basically because there are a lot of cars and sunlight present.” Hot days are especially bad for smog.
What is ozone in air quality?
Ozone is a gas composed of three atoms of oxygen. Ozone at ground level is a harmful air pollutant, because of its effects on people and the environment, and it is the main ingredient in “smog.” Learn more about air emission sources.
What is ozone gas?