Facing Environmental Issues in World's Megacities

Jakarta, Dhaka, Lagos, Mumbai, Tokyo and Mexico City are among the world's megacities that are face major environmental and social challenges.

1 minute read

October 14, 2005, 2:00 PM PDT

By Michael Dudley


"[B]y 2030, more than half of all Asians and Africans will live in urban areas. Latin America and the Caribbean will at that time be 84 percent urban, a level comparable to the U.S. As urban population grows, rural populations will shrink. Asia is projected to lose 26 million rural dwellers between 2000 and 2030.

"Mega-cities suffer from a catalog of environmental ills. A World Health Organization (WHO)/United Nations Environment Programme (UNEP) study found that seven of the citiesâ€"Mexico City, Beijing, Cairo, Jakarta, Los Angeles, Sao Paulo and Moscowâ€"had three or more pollutants that exceeded the WHO health protection guidelines. All 20 of the cities studied by WHO/UNEP had at least one major pollutant that exceeded established health limits."

Friday, October 14, 2005 in E The Environmental Magazine

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

Cover CM Credits, Earn Certificates, Push Your Career Forward

Logo for Planetizen Federal Action Tracker with black and white image of U.S. Capitol with water ripple overlay.

Planetizen Federal Action Tracker

A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

June 11, 2025 - Diana Ionescu

Rendering of Shirley Chisholm Village four-story housing development with person biking in front.

San Francisco's School District Spent $105M To Build Affordable Housing for Teachers — And That's Just the Beginning

SFUSD joins a growing list of school districts using their land holdings to address housing affordability challenges faced by their own employees.

June 8, 2025 - Fast Company

Yellow single-seat Japanese electric vehicle drivign down road.

The Tiny, Adorable $7,000 Car Turning Japan Onto EVs

The single seat Mibot charges from a regular plug as quickly as an iPad, and is about half the price of an average EV.

June 6, 2025 - PC Magazine

Rendering of autonomous cargo train moving across bridge across river in wooded area between Texas and Mexico.

Trump Approves Futuristic Automated Texas-Mexico Cargo Corridor

The project could remove tens of thousands of commercial trucks from roadways.

4 hours ago - FreightWaves

Rendering of white three-story single-stair building in Austin, Texas with staircase in the middle.

Austin's First Single Stair Apartment Building is Officially Underway

Eliminating the requirement for two staircases in multi-story residential buildings lets developers use smaller lots and more flexible designs to create denser housing.

5 hours ago - Building Design & Construction

MARTA bus with Atlanta skyline in background

Atlanta Bus System Redesign Will Nearly Triple Access

MARTA's Next Gen Bus Network will retool over 100 bus routes, expand frequent service.

6 hours ago - Mass Transit