« FCA US launches largest private fleet of CNG-powered semitrucks in Michigan; largest private CNG station in N America | Main | ContiTech develops first polyamide strut mount for Cadillac chassis vibration control; 25% lighter » In 2013, 87% of the world’s population lived in areas exceeding the World Health Organization (WHO) Air Quality Guideline of 10 μg/m 3 PM 2.5 (annual average), according to a major international study published in the ACS journal Environmental Science & Technology . Between 1990 and 2013, global population-weighted PM 2.5 increased by 20.4%, driven by trends in South Asia, Southeast Asia, and China, according to the team’s findings. However, decreases in population-weighted mean concentrations of PM 2.5 were evident in most high income countries. Additionally, the study found that the population-weighted mean concentrations of ozone increased globally by 8.9% from 1990–2013 with increases in most countries—except for modest decreases in North America, […]