Entries by Thomas Au

See where wildfire smoke is getting worse in the U.S.

Washington Post, Sept. 18, 2025, by By Shannon Osaka,  John Muyskens and  Daniel Wolfe Every year, millions of Americans’ lungs are filled with wildfire smoke — smoke that stretches from the northwest tip of Washington state to the East Coast’s most populated cities. It’s blown in from thousand-acre Canadian wildfires and from blazes in the American West. That smoke […]

Warehouses As an Environmental Justice Issue August 29, 2017 by Quan Yuan When we think of locally undesirable land uses, we often think of large power plants, puffing single plumes of pollution. But many plumes of pollution from trucks traveling to and from warehouses can have equally large impacts on health. Read more …

Warehouses worsen local air pollution Truck traffic associated with the facilities increases NO2 by 20%, study finds by Krystal Vasquez August 7, 2024  Warehouses in the US worsen local air pollution, according to a new study. Using satellite data to study the air quality around nearly 150,000 warehouses, researchers found that nitrogen dioxide levels were 20% higher […]

DEP declares Code Orange Action for Particulate on Tuesday, Aug. 5

The PA Department of Environmental Protection is concerned about wildfire smoke from Canada drifting into Pennsylvania. Excerpts from PADEP message dated Aug. 4, 2025: A(n) Air Quality Action Day has been declared for Susquehanna Valley Area, PA, on Tuesday, Aug 5   Tomorrow’s Forecast Tuesday, Aug 5: 102 AQI Unhealthy for Sensitive Groups Particle Pollution […]

DEP declares Ozone Air Quality Action Day on July 29

A(n) Air Quality Action Day has been declared for Susquehanna Valley Area, PA, on Monday, Jul 29   Tomorrow’s Forecast Monday, Jul 29: 105 AQI Unhealthy for Sensitive Groups Ozone   63 AQI Moderate Particle Pollution (2.5 microns) Extended Forecast Tuesday, Jul 30: 54 AQI Moderate Particle Pollution (2.5 microns)   50 AQI Good Ozone […]