particulate

Studies have found that particulate pollution known as PM 2.5, which is released by vehicles, industrial smokestacks and wildfires, can be attributed to as many as 200,000 excess deaths each year.

Firefighters also typically face prolonged exposure to the particulate matter in smoke when fighting wildfires in rural areas — but not the chemicals of an urban setting.

About 60% of China’s power comes from coal, which has resulted in some of the worst levels of air pollution and particulate matter in the world.

Those pollutants include particulate matter 2.5, or sooty material that is released from vehicles, industrial smokestacks and wildfires.

Their task was more difficult because of Pasadena’s temporary ban on the use of leaf blowers to limit the spread of hazardous particulates.