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Appendix B - Glossary of Terms
Pages 33-34

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From page 33...
... Nonroad -- mobile emission sources not commonly operated on public roadways such as airport ground support equipment, lawn mowers, etc. Non-volatile particles1 -- particles that exist at engine exit plane temperature and pressure conditions.
From page 34...
... These particles form on the timescales of minutes to days and may continue to form in air masses moving hundreds of kilometers from the source. Smoke -- small gas-borne solid particles, including but not limited to black carbonaceous material from the burning of fuel, which in sufficient concentration create visible opacity.


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