As Coronavirus Spreads, Air Pollution Plummets

More people are driving less and staying at home. The result is significant improvements in air quality in cities across the country.

1 minute read

April 2, 2020, 6:00 AM PDT

By Camille Fink


Gold Line alongside 210 Freeway

Frederick Dennstedt / Flickr

The coronavirus pandemic has brought life to a standstill and a huge drop in car travel as many people stay at home. "A satellite that detects emissions in the atmosphere linked to cars and trucks shows huge declines in pollution over major metropolitan areas, including Los Angeles, Seattle, New York, Chicago and Atlanta," report Brad Plumer and Nadja Popovich.

Plumer and Popovich review maps of emissions from Los Angeles, the San Francisco Bay Area, Seattle, and New York showing significant decreases in nitrogen dioxide levels over the month of March.

In Los Angeles, traffic data also illustrates the drop in car travel and congestion. "On Wednesday at 8 a.m., traffic in the city was moving 53 percent faster than it usually does on a Wednesday morning, according to data from INRIX, a company that analyzes traffic data from vehicle and phone navigation systems. At 5 p.m., when the freeways are typically congested, traffic was moving 71 percent faster than usual."

Friday, March 27, 2020 in The New York Times

portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Get top-rated, practical training

Aerial view of single-family homes with swimming pools in San Diego, California.

San Diego to Rescind Multi-Unit ADU Rule

The city wants to close a loophole that allowed developers to build apartment buildings on single-family lots as ADUs.

March 9, 2025 - Axios

Canadian flag in foreground with blurred Canadian Parliament building in background in Ottawa, Ontario, Canada.

Has President Trump Met His Match?

Doug Ford, the no-nonsense premier of Canada's most populous province, Ontario, is taking on Trump where it hurts — making American energy more expensive.

March 11, 2025 - Toronto Star

Close-up of green ULEZ sign in London, UK.

Study: London ULEZ Rapidly Cleaning up Air Pollution

Expanding the city’s ultra low-emission zone has resulted in dramatic drops in particle emissions in inner and outer London.

March 10, 2025 - Smart Cities World

Burned car and home in Los Angeles after 2019 wildfire.

The Unseen Aftermath: Wildfires’ Lasting Health and Emotional Burden

Wildfires in Los Angeles not only pose immediate physical health risks but also lead to long-term respiratory problems and mental health struggles, underscoring the need for a coordinated public health response to mitigate their lasting effects.

1 hour ago - UCLA Health

View of Central Park lake with people sitting on lakeside rocks and NYC high-rises in background.

Public Parks as Climate Resilience Tools

Designed with green infrastructure, parks can mitigate flooding, reduce urban heat, and enhance climate resilience, offering cost-effective solutions to environmental challenges while benefiting communities.

3 hours ago - Grist

Cyclists and a red T train on the Longfellow Bridge in Boston, MA at sunset.

What the Proposed Federal Budget Means for Transit, Rail

The proposed FY 2025 budget keeps spending for public transit and passenger rail essentially the same as in 2024.

5 hours ago - American Public Transportation Association

Urban Design for Planners 1: Software Tools

This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.

Planning for Universal Design

Learn the tools for implementing Universal Design in planning regulations.