Pollution

Drivers tallied 753 billion miles in the first three months of the year, the highest total on record

Heavy-duty trucks are the largest mobile source of a key precursor to dangerous ozone and particulate matter

People are infected by bacteria that, after contacting heavy metals, develop drug-resistant traits

Without the cooling effect of aerosols, warmer oceans have provided more fuel to storms

A “new peak of air pollution” every August exposes as many as 130 million people to harmful chemicals

Congress needs to fund independent research on radioactive contamination and how to clean it up

Toxic algae blooms found could have helped destabilize society

Administrator Michael Regan argues regulation of mercury, ozone, water and coal ash will also curb greenhouse gases

Vehicles can kick up radioactive dust, and fighting risks igniting a wildfire in the exclusion zone

Burning piles of used gloves, test kits and syringes release toxic pollutants. But there are ways to improve medical recycling

The U.N. passed a resolution yesterday to develop a global treaty to control plastic waste

The city has deployed a system of sensors to flag highly polluting vehicles. Nearly all of them have been repaired, helping to clean Hong Kong’s air.