UV-B

That was just the start, now we have increased UV-B entering the tropophere [that is the lower atmosphere that extends upward from ground level to about 7 miles] and reaching the surface.

warming-gate 2009

The problem we started, takes place in the stratospere [7-30 miles above the earth] where the ozone layer protect the earth by blocking harmful ultraviolet [UV-B] radiation.

warming-gate 2009

Only a limited number meet Food and Drug Administration standards for "Class 1" protection, in which 90% of UV-A radiation is blocked and 99% of UV-B radiation is blocked.

Contacts Let In Sun, But Block UV Rays Laura Johannes 2011

A number of other lenses on the market—including Cooper Companies Inc.'s Avaira and ClearSight product lines—meet Class 2 standards, in which 70% of UV-A and 95% of UV-B is blocked.

Contacts Let In Sun, But Block UV Rays Laura Johannes 2011

Some Class 2 lenses beat the standard: Avaira, for example, block at least 75% of UV-A radiation and 99% of UV-B radiation, according to the package insert.

Contacts Let In Sun, But Block UV Rays Laura Johannes 2011

Look for ones that block 99-100% of UV-A and UV-B rays.

Dr Luisa Dillner's guide to … hot weather 2010

For example, aquatic organisms that have assimilated UV-B absorbing polyaromatic hydrocarbons have shown phototoxic effects when exposed to UV-B radiation.

Climate change, interactive changes and stresses in the Arctic 2010

Experimental field evidence indicates that enhanced UV-B radiation levels mainly increase the amount of soluble UV-B-absorbing compounds in summer-green (deciduous) plants [27], but the protective functions of wall-bound phenolic compounds and epicuticular waxes in evergreens are more complicated.

Effects of ultraviolet-B on forest vegetation in the Arctic 2009

Appropriate controls in outdoor UV-B supplementation experiments.

Effects of ultraviolet-B on forest vegetation in the Arctic 2009

UV-absorbing compounds and waxes of Scots pine needles during a third growing season of supplemental UV-B.

Effects of ultraviolet-B on forest vegetation in the Arctic 2009