Please rate this as well.
The argument claims that the city dwellers have been long perplexed by the apathy of the administration towards the deteriorating air quality. Stated in this way, argument fails to mention several key factors on the basis of which it could be evaluated. The conclusion of the argument is based on several evidence for which there is no clear evidence. Hence the argument is weak and has several flaws.
Firstly, the argument readily assumes that three months since the new mayor took charge, the level of pollutants has declined by 15%. This statement is a stretch. Three months is a very short time period to measure air pollutants decline. The argument could have been much clearer if it explicitly mentions that same scenario has ever happened in the past or not. The reduction in pollution could be because of decline in construction activities, which are a major source of air pollution in cities.
Secondly, the argument claims that the cases of COPD, the most common disease known to be triggered by air pollution, has declined by 10%. This is a weak and unsupported claim, as the argument fails to mention any evidence in support of the claim. It could have been much more convincing it the author mentions any supporting evidence because, COPD is usually caused by Smoking Cigarette. The decline in COPD cases could be because of restriction on Cigarette's smoking.
Finally, the argument has mentioned that daily commuters has reported significant reduction in their travel time, this could be because of construction of new / widening of roads to help the daily commuters. There is no mention of any evidence to support this. The argument has also mentioned that a wide variety of bird species has been reported seen, the reason behind this could be the season, there is a possibility that some season birds usually arrive in the city when the commuters have reported the sight. Without convincing support to this argument, one is left with the impression that the claim is more of a wishful thinking rather than substantiated evidence.
In conclusion, the argument is flawed for above mentioned reasons. It could have been much more convincing, if the author clearly mentions the relevant facts. Without this information, the argument remains unsubstantiated and open to debate.