Sunlight and heat create conditions that increase the risk of high ozone levels".
"Days that wouldn't ordinarily have high ozone levels are going to have them".
Meanwhile, the very high ozone levels that might remove some pollutants would also irritate delicate lung tissues.
The first high ozone of the year was measured near Dartmoor on 26 May and at Sevenoaks, Kent on the 28th.
High ozone levels were associated with an increased number of hospitalizations for appendicitis and were even more strongly associated with cases of burst appendix.
An air-quality health advisory for high ozone levels was issued around 11 a.m. for New York City and Long Island, so take it easy.
Greater concentrations of ozone are more damaging than was thought: the new report reckons high ozone levels cause an 8-15% reduction in yields compared with normal crops.
The study estimated that high ozone levels in Westchester account for 61 hospital admissions for respiratory causes each year and leads to 4,887 asthma attacks, mostly in the summer, said Conrad Schneider, the organization's advocacy director.
Three weeks after Mr. Marquez's appointment, the commission used its muscle to thwart a plan, already in the works, to issue smog health advisories that would warn residents whenever there were particularly high ozone levels in and around Houston.
That year, the World Bank financed a study suggesting that high ozone levels alone were responsible for as many as 1,000 premature deaths and 35,000 hospitalizations for respiratory diseases each year in Mexico City.
Dr. Scott Schroeder, the chief of critical care and pulmonary medicine at Montefiore Hospital in the Bronx, which has two childhood asthma programs, also said high ozone levels pose a serious concern.
