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

• 是不是数量少的原因？ -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

• 这个问题挺好的。我是这么想的 -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

• 很久以前听一个学公共卫生的朋友讲:柴油车虽味儿但没汽油车污染大。 -1800800- ♂ (0 bytes) () 03/29/2009 postreply 16:15:40

• 俺听说地球上很久以前到处都是恐龙。。。 -老忽- ♂ (0 bytes) () 03/29/2009 postreply 16:31:25

• 有点儿抬杠了～～不过欢迎讨论~~ -internuts- ♂ (0 bytes) () 03/29/2009 postreply 16:42:20