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　　38 seconds to win gold in the event.03, while the 33-year-old Coughlin finished fourth in 1:00.Phelps, Franklin and Coughlin Wholesale digital flow meter Suppliers are among the Olympic champions at the meet, which continues on Saturday.69 seconds faster than at a meet in Minneapolis three weeks ago. More than 40 US national team swimmers are among about 700 set to compete, but most eyes are on Phelps.38 seconds to win the 100 meter butterfly at the event in Seattle, Washington.Michael Phelps during the preliminary 100 metre butterfly race at the US Winter National Championships in Federal Way, Washington (USA), on Friday. The 18-time Olympic gold medallist clocked 51. On Thursday, Phelps won the 200 meter individual medley in a time 1.The 18-time Olympic gold medalist clocked 51.. — AFPMichael Phelps’ Olympic comeback gained more steam Friday as he won his second race in as many days at the US Winter Nationals.In other events, Missy Franklin beat Natalie Coughlin in their first 100 meter backstroke final duel since the 2012 Olympic trials.41.Franklin won in 1:00. It is really just trying to swim the fastest time I can I think it is a good sign," Phelps said.Particulate matter with an aerodynamic diameter less than 2.5 µm and ozone 3 are amongst the most studied air pollutants, as it is found that they can get deeper into the lungs and some can also enter the blood stream. Recently, a diplomat was found to have a compromised lung condition, when he went back to this country from Delhi. The doctors insisted that he had been smoking heavily; a claim he refuted. But his lungs were in a bad shape. A closer look revealed that he had spent three winters in Delhi and this could have possibly been the reason. Environmental pollution and smog are increasing the risk of respiratory diseases in otherwise healthy adults in winter, explains Dr A. Jayachandra, senior consultant pulmonologist at Virinchi Hospitals.Q. Which pollutants in the air harm the lungs the most?Particulate matter with an aerodynamic diameter less than 2.5 µm (PM2.5) and O3 are amongst the most studied air pollutants. The miniature size of the particles is directly linked to their potential for causing health problems. Particles less than 10 µm in diameter can get deeper into the lungs and some may even get into the bloodstream. Ozone, nitric oxide, sulphur dioxide and other gases qualify as human carcinogens, as they interact with organic and inorganic compounds.Ozone is a cause of worry. It is found in two places, near the ground (troposphere) and in the upper atmosphere (stratosphere). Near the ground, it becomes a major part of the smog, leading to frequent asthma attacks in asthmatics. It is also one of the reasons for recurrent sore throats, coughs and breathing difficulties. Ground ozone also hurts plants and crops.Q. What could be the quantum of exposure per day during the three months of winter and how would this exposure harm the human body?According to the World Health Organization, the recommended PM 2.5 level is below 10 and an annual exposure to PM 2.5 of 35 microgram per meter cube or above is associated with 15 per cent higher mortality in the long run. The readings in 2017, have shown that the winters had 397 microgram per meter cube, which is 6.6 times higher than the standard level of 184 microgram per meter cube. These act as triggers, which affect the airways causing inflammation. This then leads to increased mucus production, airway muscle constriction and the swelling of the bronchial membranes, leading to wheezing, shortness of breath and chest tightness.Q. Is there any difference in how the pollutants affect women and men?It has been found that the effects are stronger in women as compared to men, in particular among older age groups. Studies of children suggest stronger effects of pollution among boys in early life, as compared to girls who have more susceptibility to pollution in later childhood.