South County residents living near the sewage-laced Tijuana River said air purifiers are helping them feel healthier, a new San Diego County Air Pollution Control District survey about the devices found.

The District, which has distributed thousands of units for free, conducted the survey and published it last week. It ran from Sept. 9 through Oct. 3. More than 1,200 people completed the 13-question survey.

The mark the first collection of public opinions about the purifiers’ effectiveness in reducing odors and overall satisfaction as a short-term relief to a decades-long problem.

The district’s distribution of the units was a response to mounting pressure from communities affected by the rotten egg-like smell of hydrogen sulfide, a gas emitted from the river that has long been polluted

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