When I said greenhouse gas didn't directly impact, I meant that if you breathe greenhouse gases, you do not have a health effect. If you breath PM and ozone, you do have a health effect.
Climate change and calculating—
On May 17th, 2007. See this statement in context.
Acting Manager, Air Health Effects Division, Healthy Environments and Consumer Safety Branch, Department of Health
When I said greenhouse gas didn't directly impact, I meant that if you breathe greenhouse gases, you do not have a health effect. If you breath PM and ozone, you do have a health effect.
Climate change and calculating—
See context to find out what was said next.