Shanghai enjoyed clear skies and fresh air yesterday, with the air quality index, at 43, in the lowest “good” tier of a six-tier scale
The average density of dangerous PM2.5 particles was 25 micrograms per cubic meter — a third of the nation’s limit of 75 — giving Shanghai a pleasant blue sky dotted with white clouds for most of the day.
“We had excellent air quality thanks to the southeast wind that brought fresh air from the sea to the city,” the Shanghai Environmental Monitoring Center said.
Shanghai’s air quality was moderately to heavily polluted for six days before the weekend when the index exceeded 150, making it “unhealthy.”
Slightly cooler temperatures also helped ease pollution. The center said air quality was affected by the density of ozone in the atmosphere over the past week. Successive sizzling days with temperatures over 38 degrees increased the proportion of ozone and degraded air quality.
The highest temperature was 35.9 degrees Celsius yesterday, the 39th day of temperatures above 35 degrees. The Shanghai Meteorological Bureau predicted 27 such days at the beginning of the summer, but that was before the city recorded its hottest July in 140 years.
The southeast wind is expected to continue to turn down the heat, with today’s maximum at around 35 degrees.
“The highest temperature in the coming weekend will hopefully fall below 35 degrees, while intermittent showers are expected,” the weather bureau said.
Typhoon Utor, which is heading toward south China. will not affect Shanghai, the weather bureau said.