Table 3.

Values of AQI classes in USA, Brazil and Mexico within the lockdown 2020 and during the same time in 2019.

Year	Country/City		Class I		Class II		Class III		Class IV		Class V		Class VI
			Per. (%)	Rg.	Per. (%)	Rg.	Per. (%)	Rg.	Per. (%)	Rg.	Per. (%)	Rg.	Per. (%)	Rg.
2020	USA	Washington	1.4	38	43.1	52–97	50	104–149	5.5	151–157	–	–	–	–
		Los Angeles	20.8	0–50	45.8	59–99	22.2	104–147	11.2	152–160	–	–	–	–
	Mexico	Ciudad de Mexico	–	–	2.6	96	11.5	109–149	84.6	151–193	1.3	211	–	–
		Guadalajara	85.9	0–50	11.5	51–87	2.6	115–125	–	–	–	–	–	–
	Brazil	Sao Paulo	15.8	18–48	15.8	65–95	38.2	102–149	30.2	151–174	–	–	–	–
2019	USA	Washington	12.5	36–50	59.7	55–100	23.6	102–142	4.2	151–156	–	–	–	–
		Los Angeles	–	–	40.3	52–99	43.1	102–144	16.6	151–159	–	–	–	–
	Mexico	Ciudad de Mexico	–	–	–	–	1.3	126	91.0	151–200	7.7	201–211	–	–
		Guadalajara	74.3	0–50	17.9	51–94	3.9	108–129	1.3	159	2.6	210–251	–	–
	Brazil	Sao Paulo	6.6	32–35	9.2	72–100	35.5	105–147	48.7	151–174	–	–	–	–

Note: Per = Percentage, Rg. = Ranges.