Particulate matter, or PM, is one of the factors the Valley Air District monitors when determining the size of particles in the air. There’s pm 2.5 and pm 10– both are measured in micrometers.

Earth Day is Tuesday, April 22. The day has been celebrated for 55 years. ... Around one in ten Americans marched that day in 1970 to demand cleaner air and water, said Davies.

The Trump administration is rolling back landmark environmental legislation that dates back to the Nixon era, including key protections for clean air and water. Republicans helped create Earth Day.

Happy Earth Day!For the 55th year, the world is using the day to celebrate Mother Nature and the wonderful planet we live on. "Earth Day really is a symbol of the environmental movement," Sarah ...

Stunning Earth Day time-lapse captures aurora glow By Trevor Mogg Published April 22, 2025 Save ... a rising column of air,” the Earth Observatory says. NASA/Earth Observatory 22. Nile River, Egypt ...

Today is the 55th Earth Day celebrated in the United States.It’s held every year on April 22 — a date originally chosen to fit college students’ schedules. But many may not know how Earth ...

Previous Earth Day themes, according to Earth Reminder, include: “Planet vs. Plastics" for Earth Day in 2024 “Invest In Our Planet” for Earth Day in 2022 and 2023.

For the first Earth Day, 20 million people went to inaugural events at schools, universities and other public areas around the country to protest for cleaner water, air and land.

On Earth Day, EPA union workers decry cuts to clean air and water regulations Fifty-five years after the first Earth Day, Environmental Protection Agency employees and advocates call for help as ...

Earth Day plantings seek to improve air quality. Gianna Holliday carries a sequoia tree seedling to plant in Detroit. (Paul Sancya / Associated Press) By Corey Williams. April 22, 2025 8:51 AM PT .

The first Earth Day in 1970 signaled the citizen push for stewarding instead of damaging our earth. We were among the ordinary people who insisted on changes — and both political parties ...

Plantings to improve air quality and celebrate Earth Day 00:55. Arborists are turning vacant land on Detroit's eastside into a small urban forest, not of elms, ...