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Composition []. The largest part of most combustion gas is nitrogen (N 2), water vapor (H 2 O) (except with pure-carbon fuels), and carbon dioxide (CO 2) (except for fuels without carbon); these are not toxic or noxious (although water vapor and carbon dioxide are greenhouse gases that contribute to global warming).A relatively small part of combustion gas is undesirable, noxious, or toxic , carbon running smog pm 2 5 for beninbuy sport cycling bicycle anti dust maskBuy BIKING N95 Antiviral Sport Face Mask with Filter Activated Carbon Running Cycling PM 2.5 AntiPollution Anti Dust Bike Mask at Wish Shopping Made. Wholesale Anti Pollution Bike Face Mask Buy Cheap in Bulk from . Specifics Caps Men Running Mask Bike Half Face Mask DustProof Face Cover Cycling Face Mask Women Men.

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