More recently, with cooler and windier weather conditions, pollution levels have been low.
We believe that it is necessary to study the dose response dependences of bioindicative plant parameters for several years because the fluctuations of weather and pollution levels can change their pattern.
For example, in the air pollution related health impact assessment, we investigated the relationships between weather and air pollution levels.
They are likely to be derived from above-ground traffic sources, and their concentrations may vary depending on the underground system (e.g., ventilation controls), above-ground urban pollution levels, and weather conditions.
Air pollution levels and weather variables in the study area from 1 January 1995 to 1 September 2005 are summarized in Table 2. Table 3 presents the estimated mean differences of fasting and PML tHcy associated with an IQR increase in the average concentrations of air pollutants in the 24 hr or in the 7 days before the study.
Increases in daily air pollution concentrations have been associated with increases in mortality, and air pollution levels often covary with weather conditions.
Pollution, both in the past and currently, is shown to be episodic rather than continuous and relationships of high pollution levels to antecedent weather, season, discharge and hydrograph position are explored.
Changes in cold-related deaths were not assessed nor were the deaths resulting from higher air pollution levels in hotter weather.
Daily variation in Beijing pollution levels is heavily dependent on weather conditions.
David Cameron came under withering attack from opposition politicians, experts and the European commission earlier this week, who accused him of failing to get to grips with air pollution levels after he labelled the smog a "naturally occurring weather phenomenon".
