Table 1.

Pre Covid PM 2.5 dispersion in part of Greater Chennai and Present Covid cases.

Pre Covid PM 2.5
Corona +ve incidence	Concentration Range in μg/m3	% Distribution
2	38–64	2.30
2	65–90	2.30
13	91–116	14.94
18	117–142	20.69
26	143–169	29.89
22	170–195	25.29
2	196–221	2.30
3	222–247	3.45
0	248–273	0.00
0	274–299	0.00