As someone living in Washington state who dealt with wildfire smoke in 2017 and 2018 it's important to note the paragraph in the article that mentions that the 2017 data was largely affected by wildfires. In our state, a lot of these originate in Canada.<p>It's an important note because the takeaway comments I see so far are directly implicating looser EPA regulations, when we don't have data to support that, yet.
Where can I find the data they refer to? These articles are maddening: they try hard to sound scienc-y and factual, yet they omit any reference that was used to draw their conclusions.
I wonder how much difference Gasoline Direct Injection has made. To meet fuel economy mandates it’s in most new car and light truck engines, and it produces way more particulates than engines that use normal fuel injection.