[ Q: Air-Quality Chart... ]

Q: Air-quality chart

On the weather page, the Daily Breeze includes an Air Quality Today bar graph from the South Coast AQMD. For the life of me, I do not understand this chart. Since smog is such a big factor in the South Bay, particularly for the elderly, it would be really helpful to find some readily understandable indication of the daily severity of the problem or a better explanation of the bar graph.

— HEINZ BARTHEL

Torrance

The yellow bars above each geographical region indicate the approximate numerical rating for the day’s air-quality rating.

A rating under 50 indicates a rating of good air quality. Ratings from 51 to 100 indicate moderate air quality; 101 to 150 is unhealthy for sensitive groups; 151 to 200 is unhealthy; and 201 to 300 is very unhealthy.

Most times the health category — good, moderate, etc. — applies to ozone pollution, but during wildfires the agency issues smoke advisories to smoke-impacted areas and the health category is typically for particulate pollution, said Tina Cherry, a spokeswoman for the South Coast Air Quality Management District.

An AQMD brochure on the Air Quality Index includes the cautionary statement it issues for ozone pollution, particulate matter — such as smoke, soot and dust pollution — and carbon-monoxide pollution.

The following precautionary statements from the brochure apply to ozone pollution:

* Moderate: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.

* Unhealthy for sensitive groups: Active children and adults, and people with lung disease, such as asthma, should reduce prolonged or heavy exertion outdoors.

* Unhealthy: The above-mentioned groups should avoid prolonged or heavy exertion outdoors. Everyone else, especially children, should reduce prolonged or heavy exertion outdoors.

* Very unhealthy: Active children and adults, and people with lung disease, should avoid all outdoor exertion. Everyone else, especially children, should avoid prolonged or heavy exertion outdoors.

For all pollutant measurements, the AQMD does not issue any precautionary statements when the health category is good. “Go out and a have a good time,” Cherry said.

For details of other pollutant-specific cautionary statements, request the Air Quality Index brochure by calling the AQMD’s Public Information Center at 909-396-3600, or download a copy from the Web site, www.aqmd.gov. Click on Community, then on Public Information, Publications, Publication Download and Brochures.

Detailed information on health-quality ratings, including hourly and daily data, is available on the AQMD Web site, at www.aqmd.gov/ smog/index.html.

— Stephanie Walton

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