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TOAR shows present-day global ozone distribution and trends relevant to health; public database

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Ozone levels across much of North America and Europe dropped significantly between 2000 and 2014. People living in parts of southern Europe, South Korea and southern Japan and China also experienced more than 15 days a year of ozone levels above 70 ppb. Trends in daily maximum ozone levels (known as 4MDA8) at urban and non-urban sites.

Ozone 255
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Study finds rising temperatures increase risk of unhealthy ozone levels absent sharp cuts in precursors

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Ozone pollution across the continental United States will become far more difficult to keep in check as temperatures rise, according to new work led by the National Center for Atmospheric Research (NCAR). Ozone formation. Even short periods of unhealthy ozone levels can cause local death rates to rise. Scenario A2 and RCP 8.5.

Ozone 199
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Rice/EPA study finds ground-level ozone falling faster than CMAQ model predicted

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Researchers from Rice University and the US Environmental Protection Agency (EPA) report in a paper in the journal Atmospheric Chemistry that particularly in Northeastern cities, ozone levels dropped even beyond what was anticipated by cutting emissions of NO x from 2002 to 2006. —Daniel Cohan, co-author. Earlier post.).

Ozone 218
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Researchers fully characterize reaction that affects ground-level ozone formation; a small but significant impact on predictive models

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The two combine in the atmosphere to make either nitric acid or peroxynitrous acid; the so-called branching ratio of these two chemicals is important in models of ozone production. This means less of the hydroxyl radical and nitrogen dioxide go away, leading to proportionately more ozone, mostly in polluted areas, Okumura said.

Ozone 210
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HEI launches two new non-tailpipe particulate emission studies

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This study will measure concentrations of non-tailpipe (NTP) particulate matter across Toronto, Canada to determine how much non-tailpipe pollution people might breathe in everyday life and how to better measure these exposures in the future. People with asthma represent a major vulnerable group.

Emissions 353
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PSI team develops web tool for consumers to compare environmental impact of passenger cars in detail

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Deterioration of the ozone layer [kg CFC-11-eq.]. The same research group has developed the web tool that makes the data and results of their ongoing studies accessible to both end users and the research community. For the future, the electricity mix can also be manually entered to test the effects of different scenarios.

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EPA launches Cleaner Trucks Initiative to update NOx standards for heavy-duty trucks

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The CTI will include a future rulemaking that will update the existing NO x standard which was last set in 2001 while also streamlining compliance and certification requirements. This action follows petitions for a rulemaking on this issue from more than 20 organizations including state and local air agencies from across the country.

EPA 249