Sentence examples for by differences in pollution from inspiring English sources

However, more complete control of confounding could explain the weaker associations observed in this study; this could also be caused by differences in pollution levels or sources between study locations.

These observations indicate the importance of intraurban variations in long-term pollution climates when estimating associations between exposure and mortality and suggest that public health impacts of air pollution may be dominated by long-term exposure determined by geographical differences in pollution climates.

Differences in pollution sources were documented by large variations in the PCB/PBDE ratios calculated for individual fish species.

Differences in estimated effects across studies may be attributable partly to differences in pollution composition and exposures across different regions, as well as differences in population susceptibility.

We used conditional logistic regression to examine the differences in pollution exposure between cases and matched controls.

Differences in pollution range across studies (Table  1) may have contributed as well.

Few studies have examined cross-country comparisons of the relationship between air pollution and birth outcomes, where differences in pollution levels may be most extreme.

The objectives of this investigation were a) to determine if racial minorities are more adversely affected by ambient air pollution than their white counterparts and b) to assess the contribution of socioeconomic status to any observed racial differences in pollution effect.

This distinction could be important, for example, if associations were modified by differences in the absorption and deposition of air pollution among distinct types of vegetation and green land cover (Givoni 1991).

Differences between studies in the HRV particulate air pollution association might also be explained by differences in the disease status of the subjects.

The biggest differences in air pollution levels according to socioeconomic status were in London.