air pollution

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References in periodicals archive ?
Perinatal air pollutant exposures and autism spectrum disorder in the children of Nurses' Health Study II participants.
Therefore, the purpose of this research is to approximate the concentration of air pollutant in the area under the Bangkok sky train platform with moving air pollutant sources by heavy traffic of vehicles in different time by using the finite difference technique.
The results indicated that vehicular movement played an important role in a gradual increase of air pollutants from morning to evening.
People breath air pollutants whether they are outdoor (outdoor air pollution) or indoor (indoor air pollution).
We considered each air pollutant separately, calculating the interquartile range for each of the 6 pollutants under the study.
These differences in results of various studies are due to numerous differences including population characteristics, individual susceptibility, technical aspect of exposure assessment methodologies, air pollutants measurements, pollution types, the duration of exposure and air pollutant particles and size.
Vehicles are the main source of air pollutants, accounting for 15 to 20 per cent of carbon dioxide emissions worldwide, the municipality noted.
The evidence suggests that high levels of certain air pollutants are associated with a higher risk of cardiovascular problems, but exactly how this association works has not been clarified.
Whilst previous studies had examined air pollution and ASD, they generally had not examined gender differences in the relationship between ASD and air pollutants. In this study most of the air pollutant associations with ASD were stronger for boys than girls however this must be interpreted with caution as a smaller number of girls with ASD were included in the analysis.
Air pollutants, which contribute to acid rain and can cause respiratory problems - sulphur dioxide (SO2), ammonia (NH3), particulate matter (PM10) and nitrogen oxides (NOx) - were found to cause EUR38-105 billion of damage a year.
The mass flow rate, N (mole/s) is proportional to a molecular diffusion coefficient, D ([cm.sub.2]/s), a cross sectional area for diffusion, A ([cm.sub.2]) and a concentration gradient of the interested air pollutant, cD (mole/[cm.sup.3])dx, where x (cm) is the one-dimensional position.
14, EPA issued a final rule to reduce toxic air pollutant emissions from metal can surface coating operations and surface coating of miscellaneous metal parts.
It leaves no oily residue, is non-corrosive, arid is not a hazardous air pollutant, the company says.
According to Environment Canada's National Pollutant Release Inventory, which monitors air pollutant emissions across Canada, their numbers indicate that the company has reduced its hydrogen sulphide emissions from 187.43 tonnes in 1999 to 94.48 tonnes in 2000.
Grant Allen, MCIC director of U of T's Pulp and Paper Centre in the chemical engineering department, is researching biofiltration techniques that use bacteria to 'eat' air pollutant byproducts from the pulp process and thereby filter out the smell.