When is the ozone content in the air the highest in a day?

In a day (sunny day), the ozone content is the highest from 3 pm to 5 pm, and the content is almost unchanged in rainy days, and it does not change much in cloudy days.

The concentration of ozone is related to temperature. The higher the temperature, the stronger the photochemical reaction, and the ozone precursors such as nitrogen oxides and hydrocarbons are more likely to be converted into ozone. With the increase of temperature, the concentration of ozone will also increase, but it will decrease after sunset and at night.

Ozone is a trace component in the atmosphere, and its concentration near the surface is 0.00 1 ~ 0.03 ppm, which is produced by oxygen in the atmosphere absorbing ultraviolet rays with wavelength less than 185nm from the sun. This ozone layer can absorb short-wave radiation (below 30nm) harmful to human body in the sun, prevent this short-wave radiation from irradiating the ground, and protect living things from ultraviolet rays.

Extended data

Hazards of ozone:

1, ozone exceeding the standard is very harmful to human body. Inhalation of excessive ozone can make people neurotoxic, lead to dizziness, headache, decreased vision and memory, destroy vitamin E in human skin, and make people's skin wrinkle and grow dark spots.

2. It will also make the leaves of plants turn yellow or even wither, which will do harm to plants and even reduce the yield and economic benefits of agricultural and forestry plants.

3. Ozone can react rapidly with indoor building materials, leading to dye fading, photo image layer fading and tire aging.

Ningbo waterway-ozone is the primary air pollutant in the near future, and the ozone concentration in suburbs is higher than that in urban areas.

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