Thanks for your question on Healthcare Magic. I can understand your concern. In my opinion, you are mostly having post inhalation bronchitis. As you are saying that you feel chest tightness after inhaling polluted air, possibility of bronchitis is more. Polluted air when inhaled can cause irritation and inflammation in airways (bronchitis). This will cause bronchospasm and this inturn causes chest pressure and tightness. So best treatment for you is to wear face mask all the time. Inhaled bronchodilator like formoterol or salmeterol are also useful to relieve chest tightness. Don t worry, you will be alright. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.