ID: 1312

AQSQID: 250270023

Site Name: Worcester

Added: April 21, 2020, 6:24 p.m.

Updated: Feb. 25, 2021, 6:32 p.m.

Location: Worcester (Downtown Worcester), MA

Reporting: True, Located: True

Current AQI: 30.0

Worcester (Downtown Worcester) MA, US: 42.263901, -71.794701

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
Feb. 25, 2021, 4 p.m. 4.0 ppb (4) 3.0 ppb (3) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A N/A N/A 7.0 μg/m3 (30) 30.0
 
Feb. 25, 2021, 3 p.m. 3.0 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.0 ppb (0) N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Feb. 25, 2021, 2 p.m. 4.0 ppb (4) 3.0 ppb (3) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Feb. 25, 2021, 1 p.m. 3.0 ppb (3) 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 25, 2021, noon 4.0 ppb (4) 2.0 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.22 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 25, 2021, 11 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.2 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Feb. 25, 2021, 10 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A N/A N/A 4.0 μg/m3 (17) 17.0
 
Feb. 25, 2021, 9 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.2 ppb (3) N/A 3.0 μg/m3 (13) 13.0
 
Feb. 25, 2021, 8 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.21 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 25, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 25, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 25, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 25, 2021, 4 a.m. 13.0 ppb (13) 2.0 ppb (2) N/A 11.0 ppb (11) N/A N/A N/A 0.23 ppb (3) N/A 13.0 μg/m3 (53) 53.0
 
Feb. 25, 2021, 3 a.m. 7.0 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A N/A 0.21 ppb (3) N/A 14.0 μg/m3 (55) 55.0
 
Feb. 25, 2021, 2 a.m. 12.0 ppb (12) 2.0 ppb (2) N/A 10.0 ppb (10) N/A N/A N/A 0.21 ppb (3) N/A 13.0 μg/m3 (53) 53.0
 
Feb. 25, 2021, 1 a.m. 6.0 ppb (6) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.22 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 25, 2021, midnight 8.0 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 24, 2021, 11 p.m. 17.0 ppb (17) 4.0 ppb (4) N/A 13.0 ppb (13) N/A 0.0 ppb (0) N/A 0.27 ppb (4) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 24, 2021, 10 p.m. 15.0 ppb (15) 3.0 ppb (3) N/A 12.0 ppb (12) N/A 0.0 ppb (0) N/A 0.3 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 24, 2021, 9 p.m. 23.0 ppb (22) 9.0 ppb (9) N/A 14.0 ppb (14) N/A 0.0 ppb (0) N/A 0.29 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 24, 2021, 8 p.m. 14.0 ppb (14) 6.0 ppb (6) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A 0.29 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 24, 2021, 7 p.m. 21.0 ppb (20) 9.0 ppb (9) N/A 13.0 ppb (13) N/A 0.0 ppb (0) N/A 0.29 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 24, 2021, 6 p.m. 11.0 ppb (11) 6.0 ppb (6) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 24, 2021, 5 p.m. 9.0 ppb (9) 4.0 ppb (4) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 25.0 μg/m3 (79) 79.0
 
Feb. 24, 2021, 4 p.m. 10.0 ppb (10) 6.0 ppb (6) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A N/A 10.0
 
Feb. 24, 2021, 3 p.m. 9.0 ppb (9) 5.0 ppb (5) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 24, 2021, 2 p.m. 12.0 ppb (12) 6.0 ppb (6) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.27 ppb (4) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 24, 2021, 1 p.m. 16.0 ppb (16) 8.0 ppb (8) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A 0.29 ppb (4) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 24, 2021, noon 42.0 ppb (40) 17.0 ppb (17) N/A 25.0 ppb (24) N/A 0.0 ppb (0) N/A 0.4 ppb (5) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 24, 2021, 11 a.m. 21.0 ppb (20) 5.0 ppb (5) N/A 16.0 ppb (16) N/A 0.0 ppb (0) N/A 0.33 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 24, 2021, 10 a.m. 17.0 ppb (17) 3.0 ppb (3) N/A 14.0 ppb (14) N/A 0.0 ppb (0) N/A 0.28 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 24, 2021, 9 a.m. 7.0 ppb (7) 2.0 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.19 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 24, 2021, 8 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.19 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
Feb. 24, 2021, 7 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.19 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 24, 2021, 6 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.2 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 24, 2021, 5 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.22 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 24, 2021, 4 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
Feb. 24, 2021, 3 a.m. 8.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (7) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 24, 2021, 2 a.m. 14.0 ppb (14) 5.0 ppb (5) N/A 9.0 ppb (9) N/A 0.0 ppb (0) N/A 0.26 ppb (4) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 24, 2021, 1 a.m. 10.0 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A 0.3 ppb (4) N/A 14.0 μg/m3 (55) 55.0
 
Feb. 24, 2021, midnight 11.0 ppb (11) 3.0 ppb (3) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A 0.29 ppb (4) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 23, 2021, 11 p.m. 10.0 ppb (10) 3.0 ppb (3) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A 0.3 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 23, 2021, 10 p.m. 11.0 ppb (11) 3.0 ppb (3) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A 0.34 ppb (4) N/A 16.0 μg/m3 (60) 60.0
 
Feb. 23, 2021, 9 p.m. 23.0 ppb (22) 9.0 ppb (9) N/A 14.0 ppb (14) N/A 0.0 ppb (0) N/A 0.35 ppb (4) N/A 14.0 μg/m3 (55) 55.0
 
Feb. 23, 2021, 8 p.m. 16.0 ppb (16) 5.0 ppb (5) N/A 11.0 ppb (11) N/A 0.0 ppb (0) N/A 0.37 ppb (5) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 23, 2021, 7 p.m. 15.0 ppb (15) 6.0 ppb (6) N/A 9.0 ppb (9) N/A 0.0 ppb (0) N/A 0.3 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 23, 2021, 6 p.m. 14.0 ppb (14) 7.0 ppb (7) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A 0.28 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
Feb. 23, 2021, 5 p.m. 12.0 ppb (12) 6.0 ppb (6) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.26 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 23, 2021, 4 p.m. 12.0 ppb (12) 6.0 ppb (6) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.27 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 23, 2021, 3 p.m. 14.0 ppb (14) 7.0 ppb (7) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.27 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
Feb. 23, 2021, 2 p.m. 13.0 ppb (13) 6.0 ppb (6) N/A 7.0 ppb (7) N/A 0.0 ppb (0) N/A 0.37 ppb (5) N/A 12.0 μg/m3 (50) 50.0
 
Feb. 23, 2021, 1 p.m. 18.0 ppb (17) 7.0 ppb (7) N/A 11.0 ppb (11) N/A 0.0 ppb (0) N/A 0.34 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
Feb. 23, 2021, noon 17.0 ppb (17) 5.0 ppb (5) N/A 12.0 ppb (12) N/A 0.0 ppb (0) N/A 0.34 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 23, 2021, 11 a.m. 14.0 ppb (14) 5.0 ppb (5) N/A 10.0 ppb (10) N/A 0.0 ppb (0) N/A 0.29 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 23, 2021, 10 a.m. 9.0 ppb (9) 2.0 ppb (2) N/A 7.0 ppb (7) N/A 0.0 ppb (0) N/A 0.26 ppb (4) N/A 15.0 μg/m3 (58) 58.0
 
Feb. 23, 2021, 9 a.m. 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 23, 2021, 8 a.m. 7.0 ppb (7) 1.0 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 23, 2021, 7 a.m. 7.0 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.26 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 23, 2021, 6 a.m. 9.0 ppb (9) 1.0 ppb (1) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 13.0 μg/m3 (53) 53.0
 
Feb. 23, 2021, 5 a.m. 8.0 ppb (8) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 23, 2021, 4 a.m. 10.0 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A 0.27 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 23, 2021, 3 a.m. 8.0 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 23, 2021, 2 a.m. 7.0 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 23, 2021, 1 a.m. 10.0 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A 0.29 ppb (4) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 23, 2021, midnight 41.0 ppb (39) 12.0 ppb (12) N/A 29.0 ppb (28) N/A 1.0 ppb (2) N/A 0.73 ppb (8) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 22, 2021, 11 p.m. 54.0 ppb (51) 15.0 ppb (15) N/A 39.0 ppb (37) N/A 1.0 ppb (2) N/A 0.63 ppb (7) N/A 13.0 μg/m3 (53) 53.0
 
Feb. 22, 2021, 10 p.m. 53.0 ppb (50) 19.0 ppb (18) N/A 35.0 ppb (34) N/A 0.0 ppb (0) N/A 0.44 ppb (5) N/A 7.0 μg/m3 (30) 50.0
 
Feb. 22, 2021, 9 p.m. 39.0 ppb (37) 14.0 ppb (14) N/A 25.0 ppb (24) N/A 0.0 ppb (0) N/A 0.4 ppb (5) N/A 8.0 μg/m3 (34) 37.0
 
Feb. 22, 2021, 8 p.m. 37.0 ppb (35) 15.0 ppb (15) N/A 22.0 ppb (21) N/A 0.0 ppb (0) N/A 0.37 ppb (5) N/A 8.0 μg/m3 (34) 35.0
 
Feb. 22, 2021, 7 p.m. 28.0 ppb (27) 10.0 ppb (10) N/A 18.0 ppb (17) N/A 0.0 ppb (0) N/A 0.33 ppb (4) N/A 6.0 μg/m3 (25) 27.0
 
Feb. 22, 2021, 6 p.m. 14.0 ppb (14) 6.0 ppb (6) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 22, 2021, 5 p.m. 17.0 ppb (17) 6.0 ppb (6) N/A 11.0 ppb (11) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 22, 2021, 4 p.m. 14.0 ppb (14) 6.0 ppb (6) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A 0.27 ppb (4) N/A 17.0 μg/m3 (62) 62.0
 
Feb. 22, 2021, 3 p.m. 27.0 ppb (26) 11.0 ppb (11) N/A 16.0 ppb (16) N/A 0.0 ppb (0) N/A 0.31 ppb (4) N/A 15.0 μg/m3 (58) 58.0
 
Feb. 22, 2021, 2 p.m. 54.0 ppb (51) 25.0 ppb (24) N/A 29.0 ppb (28) N/A 1.0 ppb (2) N/A N/A N/A 23.0 μg/m3 (74) 74.0
 
Feb. 22, 2021, 1 p.m. 62.0 ppb (60) 27.0 ppb (26) N/A 35.0 ppb (34) N/A 1.0 ppb (2) N/A 0.46 ppb (6) N/A 14.0 μg/m3 (55) 60.0
 
Feb. 22, 2021, noon 71.0 ppb (70) 33.0 ppb (32) N/A 39.0 ppb (37) N/A 1.0 ppb (2) N/A 0.51 ppb (6) N/A 22.0 μg/m3 (72) 72.0
 
Feb. 22, 2021, 11 a.m. 71.0 ppb (70) 31.0 ppb (30) N/A 41.0 ppb (39) N/A 1.0 ppb (2) N/A 0.47 ppb (6) N/A 22.0 μg/m3 (72) 72.0
 
Feb. 22, 2021, 10 a.m. 51.0 ppb (49) 16.0 ppb (16) N/A 36.0 ppb (34) N/A 0.0 ppb (0) N/A N/A N/A 22.0 μg/m3 (72) 72.0
 
Feb. 22, 2021, 9 a.m. 60.0 ppb (58) 22.0 ppb (21) N/A 39.0 ppb (37) N/A 0.0 ppb (0) N/A 0.41 ppb (5) N/A 23.0 μg/m3 (74) 74.0
 
Feb. 22, 2021, 8 a.m. 59.0 ppb (57) 21.0 ppb (20) N/A 38.0 ppb (36) N/A 0.0 ppb (0) N/A 0.41 ppb (5) N/A 19.0 μg/m3 (66) 66.0
 
Feb. 22, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.44 ppb (5) N/A 16.0 μg/m3 (60) 60.0
 
Feb. 22, 2021, 6 a.m. N/A N/A N/A N/A N/A 1.0 ppb (2) N/A 0.48 ppb (6) N/A 16.0 μg/m3 (60) 60.0
 
Feb. 22, 2021, 5 a.m. N/A N/A N/A N/A N/A 1.0 ppb (2) N/A 0.57 ppb (7) N/A 17.0 μg/m3 (62) 62.0
 
Feb. 22, 2021, 4 a.m. 99.0 ppb (99) 56.0 ppb (54) N/A 43.0 ppb (41) N/A N/A N/A 0.64 ppb (7) N/A 20.0 μg/m3 (68) 99.0
 
Feb. 22, 2021, 3 a.m. 66.0 ppb (64) 24.0 ppb (23) N/A 42.0 ppb (40) N/A N/A N/A 0.51 ppb (6) N/A 14.0 μg/m3 (55) 64.0
 
Feb. 22, 2021, 2 a.m. 63.0 ppb (61) 22.0 ppb (21) N/A 41.0 ppb (39) N/A N/A N/A 0.5 ppb (6) N/A 13.0 μg/m3 (53) 61.0
 
Feb. 22, 2021, 1 a.m. 55.0 ppb (53) 16.0 ppb (16) N/A 39.0 ppb (37) N/A 0.0 ppb (0) N/A 0.56 ppb (7) N/A 13.0 μg/m3 (53) 53.0
 
Feb. 22, 2021, midnight 36.0 ppb (34) 6.0 ppb (6) N/A 29.0 ppb (28) N/A 0.0 ppb (0) N/A 0.46 ppb (6) N/A 14.0 μg/m3 (55) 55.0
 
Feb. 21, 2021, 11 p.m. 38.0 ppb (36) 9.0 ppb (9) N/A 29.0 ppb (28) N/A 0.0 ppb (0) N/A 0.45 ppb (6) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 21, 2021, 10 p.m. 17.0 ppb (17) 7.0 ppb (7) N/A 11.0 ppb (11) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 0.0 μg/m3 (0) 17.0
 
Feb. 21, 2021, 9 p.m. 4.0 ppb (4) 2.0 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.2 ppb (3) N/A 2.0 μg/m3 (9) 9.0
 
Feb. 21, 2021, 8 p.m. 5.0 ppb (5) 3.0 ppb (3) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.27 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 21, 2021, 7 p.m. 1.0 ppb (1) 1.0 ppb (1) N/A N/A N/A 0.0 ppb (0) N/A 0.18 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Feb. 21, 2021, 6 p.m. 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.0 ppb (0) N/A 0.19 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 21, 2021, 5 p.m. 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.0 ppb (0) N/A 0.18 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 21, 2021, 4 p.m. 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.0 ppb (0) N/A 0.19 ppb (3) N/A 14.0 μg/m3 (55) 55.0
 
Feb. 21, 2021, 3 p.m. 1.0 ppb (1) 2.0 ppb (2) N/A N/A N/A 0.0 ppb (0) N/A 0.18 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 21, 2021, 2 p.m. 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.0 ppb (0) N/A 0.21 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 21, 2021, 1 p.m. 1.0 ppb (1) 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.0 ppb (0) N/A 0.2 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 21, 2021, noon 4.0 ppb (4) 1.0 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 21, 2021, 11 a.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 21, 2021, 10 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.2 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 21, 2021, 9 a.m. 2.0 ppb (2) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.19 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 21, 2021, 8 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.18 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 21, 2021, 7 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.19 ppb (3) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 21, 2021, 6 a.m. 1.0 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.19 ppb (3) N/A 4.0 μg/m3 (17) 17.0
 
Feb. 21, 2021, 5 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.19 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 21, 2021, 4 a.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.26 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 21, 2021, 3 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.21 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 21, 2021, 2 a.m. 1.0 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.2 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 21, 2021, 1 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.2 ppb (3) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 21, 2021, midnight 4.0 ppb (4) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.27 ppb (4) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 20, 2021, 11 p.m. 3.0 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 20, 2021, 10 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 20, 2021, 9 p.m. 4.0 ppb (4) 2.0 ppb (2) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 20, 2021, 8 p.m. 5.0 ppb (5) 3.0 ppb (3) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.27 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 20, 2021, 7 p.m. 4.0 ppb (4) 2.0 ppb (2) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 20, 2021, 6 p.m. 3.0 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.2 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Feb. 20, 2021, 5 p.m. 3.0 ppb (3) 2.0 ppb (2) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 20, 2021, 4 p.m. 4.0 ppb (4) 3.0 ppb (3) N/A 1.0 ppb (1) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 20, 2021, 3 p.m. 2.0 ppb (2) 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 20, 2021, 2 p.m. 6.0 ppb (6) 4.0 ppb (4) N/A 2.0 ppb (2) N/A 0.0 ppb (0) N/A 0.29 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 20, 2021, 1 p.m. 11.0 ppb (11) 6.0 ppb (6) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.27 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 20, 2021, noon 15.0 ppb (15) 7.0 ppb (7) N/A 9.0 ppb (9) N/A 0.0 ppb (0) N/A 0.29 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
Feb. 20, 2021, 11 a.m. 12.0 ppb (12) 3.0 ppb (3) N/A 9.0 ppb (9) N/A 0.0 ppb (0) N/A 0.27 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 20, 2021, 10 a.m. 18.0 ppb (17) 4.0 ppb (4) N/A 14.0 ppb (14) N/A 0.0 ppb (0) N/A 0.26 ppb (4) N/A 14.0 μg/m3 (55) 55.0
 
Feb. 20, 2021, 9 a.m. 16.0 ppb (16) 3.0 ppb (3) N/A 14.0 ppb (14) N/A 0.0 ppb (0) N/A 0.3 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 20, 2021, 8 a.m. 11.0 ppb (11) 3.0 ppb (3) N/A 9.0 ppb (9) N/A 0.0 ppb (0) N/A 0.25 ppb (3) N/A 5.0 μg/m3 (21) 21.0
 
Feb. 20, 2021, 7 a.m. 17.0 ppb (17) 6.0 ppb (6) N/A 11.0 ppb (11) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 17.0 μg/m3 (62) 62.0
 
Feb. 20, 2021, 6 a.m. 9.0 ppb (9) 2.0 ppb (2) N/A 7.0 ppb (7) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 20, 2021, 5 a.m. 7.0 ppb (7) 2.0 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) N/A 0.26 ppb (4) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 20, 2021, 4 a.m. 10.0 ppb (10) 3.0 ppb (3) N/A 7.0 ppb (7) N/A 0.0 ppb (0) N/A 0.3 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
Feb. 20, 2021, 3 a.m. 9.0 ppb (9) 2.0 ppb (2) N/A 7.0 ppb (7) N/A 0.0 ppb (0) N/A 0.28 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 20, 2021, 2 a.m. 9.0 ppb (9) 1.0 ppb (1) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A 0.3 ppb (4) N/A 13.0 μg/m3 (53) 53.0
 
Feb. 20, 2021, 1 a.m. 12.0 ppb (12) 3.0 ppb (3) N/A 9.0 ppb (9) N/A 0.0 ppb (0) N/A 0.31 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
Feb. 20, 2021, midnight 12.0 ppb (12) 3.0 ppb (3) N/A 9.0 ppb (9) N/A 0.0 ppb (0) N/A 0.33 ppb (4) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 19, 2021, 11 p.m. 12.0 ppb (12) 3.0 ppb (3) N/A 9.0 ppb (9) N/A 0.0 ppb (0) N/A 0.31 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 19, 2021, 10 p.m. 13.0 ppb (13) 3.0 ppb (3) N/A 10.0 ppb (10) N/A 0.0 ppb (0) N/A 0.32 ppb (4) N/A 14.0 μg/m3 (55) 55.0
 
Feb. 19, 2021, 9 p.m. 21.0 ppb (20) 8.0 ppb (8) N/A 13.0 ppb (13) N/A 0.0 ppb (0) N/A 0.35 ppb (4) N/A 13.0 μg/m3 (53) 53.0
 
Feb. 19, 2021, 8 p.m. 18.0 ppb (17) 7.0 ppb (7) N/A 11.0 ppb (11) N/A 0.0 ppb (0) N/A 0.36 ppb (5) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 19, 2021, 7 p.m. 14.0 ppb (14) 6.0 ppb (6) N/A 9.0 ppb (9) N/A 0.0 ppb (0) N/A 0.32 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 19, 2021, 6 p.m. 16.0 ppb (16) 7.0 ppb (7) N/A 9.0 ppb (9) N/A 0.0 ppb (0) N/A 0.29 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 19, 2021, 5 p.m. 14.0 ppb (14) 6.0 ppb (6) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A 0.28 ppb (4) N/A 14.0 μg/m3 (55) 55.0
 
Feb. 19, 2021, 4 p.m. 19.0 ppb (18) 8.0 ppb (8) N/A 12.0 ppb (12) N/A 0.0 ppb (0) N/A 0.32 ppb (4) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 19, 2021, 3 p.m. 18.0 ppb (17) 7.0 ppb (7) N/A 11.0 ppb (11) N/A 0.0 ppb (0) N/A 0.34 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 19, 2021, 2 p.m. 17.0 ppb (17) 7.0 ppb (7) N/A 11.0 ppb (11) N/A 0.0 ppb (0) N/A 0.46 ppb (6) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 19, 2021, 1 p.m. 23.0 ppb (22) 9.0 ppb (9) N/A 14.0 ppb (14) N/A 0.0 ppb (0) N/A 0.62 ppb (7) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 19, 2021, noon 17.0 ppb (17) 5.0 ppb (5) N/A 11.0 ppb (11) N/A 0.0 ppb (0) N/A 0.41 ppb (5) N/A 13.0 μg/m3 (53) 53.0
 
Feb. 19, 2021, 11 a.m. 13.0 ppb (13) 3.0 ppb (3) N/A 10.0 ppb (10) N/A 0.0 ppb (0) N/A 0.28 ppb (4) N/A 6.0 μg/m3 (25) 25.0
 
Feb. 19, 2021, 10 a.m. 11.0 ppb (11) 3.0 ppb (3) N/A 9.0 ppb (9) N/A 0.0 ppb (0) N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
Feb. 19, 2021, 9 a.m. 10.0 ppb (10) 2.0 ppb (2) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A 0.34 ppb (4) N/A 10.0 μg/m3 (42) 42.0
 
Feb. 19, 2021, 8 a.m. 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) N/A 0.22 ppb (3) N/A 7.0 μg/m3 (30) 30.0
 
Feb. 19, 2021, 7 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.22 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
Feb. 19, 2021, 6 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.23 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 19, 2021, 5 a.m. N/A N/A N/A N/A N/A 0.0 ppb (0) N/A 0.22 ppb (3) N/A 12.0 μg/m3 (50) 50.0
 
Feb. 19, 2021, 4 a.m. 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A N/A 0.23 ppb (3) N/A 13.0 μg/m3 (53) 53.0
 
Feb. 19, 2021, 3 a.m. 9.0 ppb (9) 2.0 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A 0.24 ppb (3) N/A 14.0 μg/m3 (55) 55.0
 
Feb. 19, 2021, 2 a.m. 8.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (7) N/A N/A N/A 0.24 ppb (3) N/A 11.0 μg/m3 (46) 46.0
 
Feb. 19, 2021, 1 a.m. 9.0 ppb (9) 2.0 ppb (2) N/A 7.0 ppb (7) N/A 0.0 ppb (0) N/A 0.24 ppb (3) N/A 13.0 μg/m3 (53) 53.0
 
Feb. 19, 2021, midnight 16.0 ppb (16) 4.0 ppb (4) N/A 12.0 ppb (12) N/A 0.0 ppb (0) N/A 0.31 ppb (4) N/A 16.0 μg/m3 (60) 60.0
 
Feb. 18, 2021, 11 p.m. 17.0 ppb (17) 3.0 ppb (3) N/A 13.0 ppb (13) N/A 0.0 ppb (0) N/A 0.38 ppb (5) N/A 16.0 μg/m3 (60) 60.0
 
Feb. 18, 2021, 10 p.m. 18.0 ppb (17) 4.0 ppb (4) N/A 14.0 ppb (14) N/A 0.0 ppb (0) N/A 0.35 ppb (4) N/A 9.0 μg/m3 (38) 38.0
 
Feb. 18, 2021, 9 p.m. 22.0 ppb (21) 6.0 ppb (6) N/A 16.0 ppb (16) N/A 0.0 ppb (0) N/A 0.35 ppb (4) N/A 12.0 μg/m3 (50) 50.0
 
Feb. 18, 2021, 8 p.m. 24.0 ppb (23) 8.0 ppb (8) N/A 16.0 ppb (16) N/A 0.0 ppb (0) N/A 0.32 ppb (4) N/A 8.0 μg/m3 (34) 34.0
 
Feb. 18, 2021, 7 p.m. 22.0 ppb (21) 8.0 ppb (8) N/A 14.0 ppb (14) N/A 0.0 ppb (0) N/A 0.29 ppb (4) N/A 1.0 μg/m3 (5) 21.0
 
Feb. 18, 2021, 6 p.m. 17.0 ppb (17) 7.0 ppb (7) N/A 10.0 ppb (10) N/A 0.0 ppb (0) N/A 0.29 ppb (4) N/A 17.0 μg/m3 (62) 62.0
 
Feb. 18, 2021, 5 p.m. 14.0 ppb (14) 6.0 ppb (6) N/A 8.0 ppb (8) N/A 0.0 ppb (0) N/A 0.3 ppb (4) N/A 12.0 μg/m3 (50) 50.0