Dan: Like this piece here? It has all these turquoise designs on it. Maddie: Yep. During the Late Warring States Period, the production of bronze was no longer as strictly controlled as before. Dan: So you no longer had to be an official or a ruler to own bronzes? Maddie: No, you just needed moolah. The designs changed to meet the needs of the new buyers. Dan: This bronze has gold plating. Maddie: That's a Han Dynasty incense burner. Pieces like that signal the decline of the bronze.
The research focused on particles less than 2.5 micrometers in diameter, known as PM2.5s. These fine particles are thought to kill by lodging deep in the lungs. The researchers found that the long-term death rate from lung cancer rose by 8 per cent for every 10-microgram increase in the average concentration of PM2.5s per cubic meter. The increased risk is comparable with the risks to long term passive smokers.