For the first time in five years california authorities have issued a first stage smog alert, warning people in some areas of unhealthy levels of ozone in the air. smog contains several dangerous chemical compounds beside ozone: sulfur dioxide, nitrogen dioxide, and carbon monoxide. since it would be impossible to wear gas masks like those in the picture, a reasonable plan would be to

One reasonable plan would be to wear a face mask or surgical mask. Take note that your surgical mask contains two sides – the white side and the blue side. Since the main purpose of your mask usage is to prevent yourself from inhaling too much bad air, the blue side of the mask should be the one touching your skin. This is because the white side of your mask helps you prevent from coming in contact with toxins that may come from the smog. 

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this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.