4. Diesel Particulate Matter (10 points) a.) What are some of the challenges in

Question

4. Diesel Particulate Matter (10 points) a.) What are some of the challenges in controlling the levels of diesel particulate matter in air? b.) Why would controlling diesel particulate matter be beneficial for mitigating climate change? c) The NAAQS for PM2 s is set at 35 g/m3 (24-hr average). The 24-hr average PMs concentration in Klamath Falls, a small town in Oregon, from 2007-2009 was 45 ug/m. Let's assume that 4 % of the PM2.5 concentration is diesel. The ambient benchmark concentration for diesel PM is 0.1 ug/m i.) Calculate the excess cancer risk due to diesel PM in Klamath Falls .) What does the number that you calculated mean in terms of risk?

Explanation / Answer

One of the major challenges with regards to diesel particulate matter in air is that diesel exhaust gas contains higher amount of particulate matter and NOx emissions that are responsible of severe environmental and health problems. Pollutants emitted by diesel engines cause adverse effect to human health and lead to environmental challenges like acid rains, ground-level ozone, and reduction of visibility. Exposure to diesel exhaust gas is also known to cause damage of lungs and other respiratory problems.

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