Using data from the 1970s to the 1990s the studies purport to show that parental smoking makes the crucial difference between getting ill and not getting ill. Or something like that. As if there were no other factors to be considered.
Local air quality information is here. It's a recognized issue, and note that the issue of smoking is not even mentioned in this local guidance. The critical thing is:
Sometimes the amount of ozone or particulate pollution can violate federal standards.Sometimes. Pollutant levels vary, from day to day and from region to region. It is therefore impossible to draw conclusions about the impact of passive smoking exposure. You can establish that one or two parents smoke, but can you then factor in whether visiting friends and relatives smoke, for how many hours a day, how big the house is, or how well ventilated? What were they smoking? All these variables for a single 'pollutant'. Then we get to the outdoor pollutants. Where did the children live? How exposed were they to the pollutants and for how long? How bad was the pollution? No one can make accurate generalisations over such things.