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If the EPA lowers ground-level ozone - a decision it is likely to make this month - some businesses, cities and regions will be affected more than others, HPAC Engineering reports.

NASA research shows Earth's atmosphere contains an unexpectedly large amount of an ozone-depleting compound from an unknown source decades after the compound was banned worldwide.

Scientists are still trying to unravel the damaging effects of ground-level ozone on life on earth. But as the world warms, their concerns about the impact of this highly toxic, pollution-caused gas are growing.

To shrink the hole in the ozone layer, we need to cut down on dangerous substitutes for ozone-depleting substances

Governments have delivered the third major international climate change agreement inside 12 months, thanks to a new global deal to phase out the use of hydrofluorocarbons (HFCs). Nearly 200 countries signed off on the deal to amend the existing Montreal Protocol covering ozone layer-depleting chlorofluorocarbons (CFCs) and extend it to apply to the powerful HFC greenhouse gases commonly used in fridges, air conditioning units and aerosol sprays.

Governments have delivered the third major international climate change agreement inside 12 months, thanks to a new global deal to phase out the use of hydrofluorocarbons (HFCs). Nearly 200 countries signed off on the deal to amend the existing Montreal Protocol covering ozone layer-depleting chlorofluorocarbons (CFCs) and extend it to apply to the powerful HFC greenhouse gases commonly used in fridges, air conditioning units and aerosol sprays.

The Environmental Protection Agency is expected to propose tightening limits on ozone, the lung-damaging ingredient in smog, to between 65 to 70 parts per billion. The current standard of 75 parts per billion has been in place since 2008.

The EPA proposed strengthening 2008 air quality standards to reduce smog. The new standards would drop the limit on pollution-forming ozone from the current 75 parts per billion (ppb) to within 60-70 ppb.