A quick review of thermodynamics when designing systems for exhaust gas aftertreatment (EGAT) can have a long-lasting impact.

SINGAPORE — Hazy conditions in Singapore on the morning of March 26 were likely due to the accumulation of particulate matter under light wind conditions over Singapore, said the weatherman.

When wildfires threaten communities, their health impact extends far beyond the flames. Smoke lingers in the air ... better than new and more expensive HEPA air filters for the larger particle size ...