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The various chemicals emitted in exhaust gasses from an internal combustion engine. The usual gasses which are measured through emissions testing are Nitrogen Oxide (NO2), Carbon Monoxide (CO2), and HydroCarbons (HC).
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Exhaust gas composition from London buses
I asked this on Reddit earlier this week, but nobody had much technical insight.
Can anyone shed light on why exhaust gas from a typical London bus smells entirely different from a coach or truck's ex …