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Air Quality

The San Diego Region has made great strides towards clean air.

Despite continued growth in population and motor vehicle usage, the San Diego Region has experienced substantial improvement in air quality since 1977, the earliest year with comparable data. The state one-hour ozone standard was exceeded on 168 days in 1977, improving to 12 days over standard in 2004, chalking up a remarkable 93% improvement. Over the same 27-year period (1977 to 2004, the region’s population grew by 70% (from 1.7 million to 3 million) and daily motor vehicle mileage more than doubled.

Advances have been made in improving our air quality but complacency cannot be allowed. Motor vehicles continue to be the biggest source of air pollution in the San Diego Region. The Coalition’s work must continue make even more improvements to our air.
Information provided by San Diego County Air Pollution Control District.

To find out more about air quality go to SDAPCD



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Photos - DOE/NREL - National Renewable Energy Laboratory

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