'Near the ground, this gas is a major part of smog; at higher altitudes, it helps block radiation from the sun'
ozone
THE BAD AIR UP THERE: Near the ground, this gas is a major part of smog; at higher altitudes, it helps block radiation from the sun
Near the ground, this gas is a major part of smog; at higher altitudes, it helps block radiation from the sun
Near the ground, this gas is a major part of smog; at higher altitudes, it helps block radiation from the sun
THE BAD AIR UP THERE
ozone
THE BAD AIR UP THERE