Dilema: people say diesel polutes air but no smog for diesel car

Isn't it interesting? One side people say diesel cars polute air quality more than gas engine ones, but as we all know, California has the most stringent air emission standard in US, but diesel cars are not required to go smog tests.

I have 3 diesel cars - full house of diesels but no gas... I don't need to go smog tests at all. Every year, when a car registration is due, I receive a letter noticing me for registration but no emission test is required. I just log on to DMV website and pay the registration fee. A few days later I receive the tag. That is it.

The same non-smog-test-required is for electric hybrid cars, too. Does that mean diesel cars have the same polution level than hybrids? Correct me if I am wrong.

所有跟帖： 

• Ding!!! -OregonRain- ♀ (0 bytes) () 03/29/2009 postreply 11:05:25

• 嘿嘿，have a good afternoon! -internuts- ♂ (0 bytes) () 03/29/2009 postreply 12:30:26

• 是不是數量少的原因？ -老忽- ♂ (65 bytes) () 03/29/2009 postreply 11:19:01

• Maybe but not likely. CA Air Board are very hawkish -internuts- ♂ (0 bytes) () 03/29/2009 postreply 16:38:15

• 這個問題挺好的。我是這麽想的 -woth- ♀ (925 bytes) () 03/29/2009 postreply 11:42:11

• En, sounds right, thx -internuts- ♂ (0 bytes) () 03/29/2009 postreply 16:39:24

• Smog law is based on out-dated concerns. -UberAlles- ♂ (803 bytes) () 03/29/2009 postreply 14:19:27

• SMOG is mostly focused on Nox and CO2, diesel in those are low -internuts- ♂ (0 bytes) () 03/29/2009 postreply 16:40:30

• Smog is a serious public health issue, although less a green hou -cys254- ♂ (234 bytes) () 03/30/2009 postreply 09:35:38

• 很久以前聽一個學公共衛生的朋友講:柴油車雖味兒但沒汽油車汙染大。 -1800800- ♂ (0 bytes) () 03/29/2009 postreply 16:15:40

• 俺聽說地球上很久以前到處都是恐龍。。。 -老忽- ♂ (0 bytes) () 03/29/2009 postreply 16:31:25

• 有點兒抬杠了～～不過歡迎討論~~ -internuts- ♂ (0 bytes) () 03/29/2009 postreply 16:42:20