Biology, 03.12.2019 19:31 genyjoannerubiera
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
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