NEA to provide hourly PSI readings until haze ends
Updates will also be the average of previous three hours
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IN SINGAPORE: The state of the haze yesterday, as seen from the Esplanade waterfront and Jalan Toa Payoh (above). PSI readings yesterday hit a high of 79 at 7am, but changing wind directions helped to improve conditions. The reading publicised at 7pm yesterday was 52. -- ST PHOTOS: ALPHONSUS CHERN, DESMOND LUI
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IN SINGAPORE: The state of the haze yesterday, as seen from the Esplanade waterfront (above) and Jalan Toa Payoh. PSI readings yesterday hit a high of 79 at 7am, but changing wind directions helped to improve conditions. The reading publicised at 7pm yesterday was 52. -- ST PHOTOS: ALPHONSUS CHERN, DESMOND LUI
IN SINGAPORE: The state of the haze yesterday, as seen from the Esplanade waterfront and Jalan Toa Payoh (above). PSI readings yesterday hit a high of 79 at 7am, but changing wind directions helped to improve conditions. The reading publicised at 7pm yesterday was 52. -- ST PHOTOS: ALPHONSUS CHERN, DESMOND LUI
IN SINGAPORE: The state of the haze yesterday, as seen from the Esplanade waterfront (above) and Jalan Toa Payoh. PSI readings yesterday hit a high of 79 at 7am, but changing wind directions helped to improve conditions. The reading publicised at 7pm yesterday was 52. -- ST PHOTOS: ALPHONSUS CHERN, DESMOND LUI
With the haze worsening yesterday, the authorities have started providing hourly updates to keep the public better informed.
Previously, readings of the Pollutant Standards Index (PSI) were taken only at 8am, noon and 4pm daily, and they reflected 24-hour averages.
Since yesterday, readings have been taken hourly, and they reflect the average of the PSI readings for the previous three hours.
Readings from 7am to 7pm will be posted on the National Environment Agency's (NEA) website.
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Background story
New PSI readings
PSI readings taken at 8am, noon and 4pm are 24-hour readings averaged over the past one day. But the new hourly readings introduced today are averaged from the readings of the preceding three hours. While the 24-hour reading is more accurate, the hourly reading is more relevant for people making decisions about outdoor activities, said a spokesman for the National Environment Agency.
