Ozone forms in the air from chemical reactions involving pollutants such as oxides of nitrogen (collectively known as NOX) and volatile organic compounds such as benzene.
As soon as they are emitted to the atmosphere, however, hydrocarbons are destroyed by chemical reactions involving pollutants such as ozone.
The procedures and results of these studies clearly indicate the need for expertise in environmental science and related disciplines in epidemiologic studies involving pollutant emissions.
Nutritional and genetic factors have been implicated [ 54] but while, undoubtedly, they are involved, environmental pollutants may be acting in conjunction with them to exacerbate the decline in fertility through additive, subtle effects on gene expression and/or disruption of endocrine signals.
The effect of the aging on the main parameters involved in pollutant removal in CWs (temperature, pH, conductivity, dissolved oxygen concentration and redox potential) was assessed.
The second sensitivity analysis involved two-pollutant models for a selected set of constituents for the outcome IHD mortality.
Damage calculation was performed using a computer model known as the ECOSENSE model; it involved combining pollutant concentration and population maps in order to calculate the value of the damage caused by the pollution on human health, crops, and building materials.
Interest in expanding market-based approaches involving intra-pollutant trading (trading "like" pollutants) to allow inter-pollutant trading (trading "dis-similar" pollutants) is growing.
The costs being calculated, by the way, don't include the long-run threat of climate change; they're focused on measurable impacts of pollution on health and productivity, with the most important effects involving how pollutants — especially small particulates — affect human health, and use standard valuations on mortality and morbidity to turn these into dollars.
Since 1970, such waivers have been routinely granted more than 50 times involving tailpipe pollutants that foul the air in some states more than in others.
The past week's American Geophysical Union meeting examined two recent incidents—one involving industrial pollutants, the other natural dust where the crud reached the west coast of America all the way from Asia.
