Ground-level ozone, a component of smog, forms when hydrocarbons and nitrogen oxides react with sunlight.
The U.S. Environmental Protection Agency EPAA) tightened its standard for ground-level ozone, a component of smog, to improve health and also proposed a secondary standard for the environment.
Bind et al. now examined whether concentrations of ozone and components of fine particle mass are associated with changes in methylation on tissue factor (F3), interferon gamma (IFN-γ), interleukin 6 (IL-6), toll-like receptor 2 (TLR-2), and intercellular adhesion molecule 1 (ICAM-1).
The two SOA atmospheres were generated in a continuous flow stir reaction chamber as described by McDonald et al. (2010), with the exception that the ozone and components of nitrogen oxides (NOx) of the gaseous fraction of the atmosphere were removed using a spent honeycomb carbon denuder.
More heat speeds the chemical reactions that create ozone, the primary component of smog.
Arvin's level of ozone, the primary component in smog, exceeded the amount considered acceptable by the agency on an average of 73 days per year from 2004 to 2006.
The standards governing ozone — the main component of harmful smog — are supposed to be set every five years.
Other major air pollutants, including ozone, an important component of smog, and smaller particulate matter, called PM 2.5, emitted when gasoline is burned, are not widely monitored in China.
They used air pollution data from monitors in each city to calculate daily maximum concentrations of ozone, a normal component of the earth's upper atmosphere that becomes a danger when concentrated at ground level.
Ozone (a key component of smog) is also a gaseous pollutant; it forms in the atmosphere via complex chemical reactions occurring between nitrogen dioxide and various volatile organic compounds (e.g., gasoline vapours).
