The carbon particle appeared in the exhaust is what we called is particulate. In the industry, particulate filter can be used to remove the particulate.
你的心想抽去CO2氣 , 防止染及天氣變熱 , 即是環保 . 表面上用電車就無氣出 , 咪無carbon . 但電力由coal亦是有CO2出 ! 現在還未有此合經濟 , 有效又環保方法 . 用太陽能嗎 ? 表面環保但貴低效時 , 亦不是環保方法了 . You can walk , this is best for your health !!!