Regarding follow-up: Since factory workers were involved it should be easy to know where the affected patients are staying, also due to medico-legal case, police would have details. After 2 years it would be very interesting to know how many are suffering from respiratory ailments or have reduced pulmonary function test results. It would add greatly to our knowledge of effects of chlorine gas on lungs, morbidity and mortality if any after two years.

• competing interests: no
• Invited by the author to make a review on this article? :
• Experience and credentials in the specific area of science: None
• Publications in the same or a related area of science: No
  
• References: None