Claim: The warmer the planet gets, the more ozone forms, and by mid-century, Americans will likely suffer a 70 percent increase in unhealthy ozone smog, the National Center for Atmospheric Research has projected.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Climate model projections summarized in the report indicated that during the 21st century the global surface temperature is likely to rise a further 0.3 to 1.7 °C (0.5 to 3.1 °F) in a moderate scenario, or as much as 2.6 to 4.8 °C (4.7 to 8.6 °F) in an extreme scenario, depending on the rate of future greenhouse gas emissions and on climate feedback effects.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: So far, ozone depletion in most locations has been typically a few percent and, as noted above, no direct evidence of health damage is available in most latitudes.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Reductions of up to 70 percent in the ozone column observed in the austral (southern hemispheric) spring over Antarctica and first reported in 1985 (Farman et al.)

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: Some stratospheric cooling is also predicted from increases in greenhouse gases such as CO 2 and CFCs themselves; however, the ozone-induced cooling appears to be dominant.

Relevance (1 = gold evidence, 0 = mined hard negative): 1
Passage: According to the same report, the city experienced a significant reduction in high ozone days since 2001—from nearly 50 days per year to fewer than 10—along with fewer days of high particle pollution since 2000—from about 19 days per year to about 3—and an approximate 30% reduction in annual levels of particle pollution since 2000.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: The US EPA has estimated that limiting ground-level ozone concentration to 65 parts per billion, would avert 1,700 to 5,100 premature deaths nationwide in 2020 compared with the 75-ppb standard.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Higher air temperature also increase the concentration of ozone at ground level.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: During the late 20th century, a scientific consensus evolved that increasing concentrations of greenhouse gases in the atmosphere cause a substantial rise in global temperatures and changes to other parts of the climate system, with consequences for the environment and for human health.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Organic compounds such as chlorofluorocarbons (CFC’s) have generated an unwanted opening in the ozone layer, which emits higher levels of ultraviolet radiation putting the globe at large threat.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: In the lower atmosphere, ozone is a harmful pollutant.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Ozone in smog is formed through chemical reactions involving nitrogen oxides and other compounds.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Many risks increase with higher magnitudes of global warming.

Relevance (1 = gold evidence, 0 = mined hard negative): 0
Passage: Summer smog, which is common in major cities such as London, Birmingham, New York City and Los Angeles, is caused by pollutants, mainly ozone, which collect in large cities, especially during the summer.