ID: 7720

AQSQID: 840250170010

Site Name: Chelmsfordnr

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

Updated: Oct. 25, 2021, 11:02 a.m.

Location: Chelmsford (E Chelmsford), MA

Reporting: True, Located: True

Current AQI: 46.0

Chelmsford (E Chelmsford) MA, US: 42.612113, -71.307519

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
Oct. 25, 2021, 9 a.m. 31.0 ppb (30) 17.0 ppb (17) N/A 14.0 ppb (14) N/A N/A 1.0 ppb (1) N/A N/A 11.0 μg/m3 (46) 46.0
 
Oct. 25, 2021, 8 a.m. 22.0 ppb (21) 12.0 ppb (12) N/A 10.0 ppb (10) N/A N/A 1.0 ppb (1) N/A N/A 10.0 μg/m3 (42) 42.0
 
Oct. 25, 2021, 7 a.m. 27.0 ppb (26) 17.0 ppb (17) N/A 10.0 ppb (10) N/A N/A 1.0 ppb (1) N/A N/A 9.0 μg/m3 (38) 38.0
 
Oct. 25, 2021, 6 a.m. 24.0 ppb (23) 13.0 ppb (13) N/A 10.0 ppb (10) N/A N/A 1.0 ppb (1) N/A N/A 9.0 μg/m3 (38) 38.0
 
Oct. 25, 2021, 5 a.m. 31.0 ppb (30) 19.0 ppb (18) N/A 12.0 ppb (12) N/A N/A 1.0 ppb (1) N/A N/A 9.0 μg/m3 (38) 38.0
 
Oct. 25, 2021, 4 a.m. 53.0 ppb (50) 38.0 ppb (36) N/A 15.0 ppb (15) N/A N/A 1.0 ppb (1) N/A N/A 8.0 μg/m3 (34) 50.0
 
Oct. 25, 2021, 3 a.m. 41.0 ppb (39) 25.0 ppb (24) N/A 15.0 ppb (15) N/A N/A 1.0 ppb (1) N/A N/A 7.0 μg/m3 (30) 39.0
 
Oct. 25, 2021, 2 a.m. 33.0 ppb (32) 17.0 ppb (17) N/A 16.0 ppb (16) N/A N/A 2.0 ppb (2) N/A N/A 7.0 μg/m3 (30) 32.0
 
Oct. 25, 2021, 1 a.m. 42.0 ppb (40) 25.0 ppb (24) N/A 16.0 ppb (16) N/A N/A 1.0 ppb (1) N/A N/A 8.0 μg/m3 (34) 40.0
 
Oct. 25, 2021, midnight 25.0 ppb (24) 10.0 ppb (10) N/A 14.0 ppb (14) N/A N/A 3.0 ppb (3) N/A N/A 5.0 μg/m3 (21) 24.0
 
Oct. 24, 2021, 11 p.m. 32.0 ppb (31) 14.0 ppb (14) N/A 18.0 ppb (17) N/A N/A 1.0 ppb (1) N/A N/A 5.0 μg/m3 (21) 31.0
 
Oct. 24, 2021, 10 p.m. 30.0 ppb (29) 11.0 ppb (11) N/A 19.0 ppb (18) N/A N/A 3.0 ppb (3) N/A N/A 5.0 μg/m3 (21) 29.0
 
Oct. 24, 2021, 9 p.m. 18.0 ppb (17) 5.0 ppb (5) N/A 12.0 ppb (12) N/A N/A 12.0 ppb (12) N/A N/A 4.0 μg/m3 (17) 17.0
 
Oct. 24, 2021, 8 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 23.0 ppb (22) N/A N/A 3.0 μg/m3 (13) 22.0
 
Oct. 24, 2021, 7 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 2.0 ppb (2) N/A N/A 26.0 ppb (25) N/A N/A 2.0 μg/m3 (9) 25.0
 
Oct. 24, 2021, 6 p.m. 9.0 ppb (9) 5.0 ppb (5) N/A 4.0 ppb (4) N/A N/A 25.0 ppb (24) N/A N/A 2.0 μg/m3 (9) 24.0
 
Oct. 24, 2021, 5 p.m. 10.0 ppb (10) 6.0 ppb (6) N/A 4.0 ppb (4) N/A N/A 24.0 ppb (23) N/A N/A 2.0 μg/m3 (9) 23.0
 
Oct. 24, 2021, 4 p.m. 7.0 ppb (7) 4.0 ppb (4) N/A 3.0 ppb (3) N/A N/A 23.0 ppb (22) N/A N/A 3.0 μg/m3 (13) 22.0
 
Oct. 24, 2021, 3 p.m. 4.0 ppb (4) 3.0 ppb (3) N/A 2.0 ppb (2) N/A N/A 23.0 ppb (22) N/A N/A 3.0 μg/m3 (13) 22.0
 
Oct. 24, 2021, 2 p.m. 5.0 ppb (5) 3.0 ppb (3) N/A 2.0 ppb (2) N/A N/A 20.0 ppb (19) N/A N/A 3.0 μg/m3 (13) 19.0
 
Oct. 24, 2021, 1 p.m. 6.0 ppb (6) 3.0 ppb (3) N/A 2.0 ppb (2) N/A N/A 19.0 ppb (18) N/A N/A 3.0 μg/m3 (13) 18.0
 
Oct. 24, 2021, noon 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 15.0 ppb (14) N/A N/A 4.0 μg/m3 (17) 17.0
 
Oct. 24, 2021, 11 a.m. 7.0 ppb (7) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A 11.0 ppb (11) N/A N/A 4.0 μg/m3 (17) 17.0
 
Oct. 24, 2021, 10 a.m. 7.0 ppb (7) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A 11.0 ppb (11) N/A N/A 4.0 μg/m3 (17) 17.0
 
Oct. 24, 2021, 9 a.m. 10.0 ppb (10) 4.0 ppb (4) N/A 6.0 ppb (6) N/A N/A 9.0 ppb (9) N/A N/A 4.0 μg/m3 (17) 17.0
 
Oct. 24, 2021, 8 a.m. 20.0 ppb (19) 10.0 ppb (10) N/A 10.0 ppb (10) N/A N/A 3.0 ppb (3) N/A N/A 5.0 μg/m3 (21) 21.0
 
Oct. 24, 2021, 7 a.m. 7.0 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A 9.0 ppb (9) N/A N/A 5.0 μg/m3 (21) 21.0
 
Oct. 24, 2021, 6 a.m. 22.0 ppb (21) 9.0 ppb (9) N/A 13.0 ppb (13) N/A N/A 3.0 ppb (3) N/A N/A 5.0 μg/m3 (21) 21.0
 
Oct. 24, 2021, 5 a.m. 10.0 ppb (10) 3.0 ppb (3) N/A 7.0 ppb (7) N/A N/A 10.0 ppb (10) N/A N/A 5.0 μg/m3 (21) 21.0
 
Oct. 24, 2021, 4 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A N/A 17.0 ppb (16) N/A N/A 5.0 μg/m3 (21) 21.0
 
Oct. 24, 2021, 3 a.m. 7.0 ppb (7) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A 16.0 ppb (15) N/A N/A 5.0 μg/m3 (21) 21.0
 
Oct. 24, 2021, 2 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 18.0 ppb (17) N/A N/A 5.0 μg/m3 (21) 21.0
 
Oct. 24, 2021, 1 a.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A N/A 20.0 ppb (19) N/A N/A 4.0 μg/m3 (17) 19.0
 
Oct. 24, 2021, midnight 5.0 ppb (5) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 22.0 ppb (21) N/A N/A 4.0 μg/m3 (17) 21.0
 
Oct. 23, 2021, 11 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A N/A 22.0 ppb (21) N/A N/A 4.0 μg/m3 (17) 21.0
 
Oct. 23, 2021, 10 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A N/A 21.0 ppb (20) N/A N/A 5.0 μg/m3 (21) 21.0
 
Oct. 23, 2021, 9 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A N/A 22.0 ppb (21) N/A N/A 4.0 μg/m3 (17) 21.0
 
Oct. 23, 2021, 8 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 25.0 ppb (24) N/A N/A 3.0 μg/m3 (13) 24.0
 
Oct. 23, 2021, 7 p.m. 7.0 ppb (7) 4.0 ppb (4) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (25) N/A N/A 4.0 μg/m3 (17) 25.0
 
Oct. 23, 2021, 6 p.m. 9.0 ppb (9) 5.0 ppb (5) N/A 4.0 ppb (4) N/A N/A 24.0 ppb (23) N/A N/A 3.0 μg/m3 (13) 23.0
 
Oct. 23, 2021, 5 p.m. 10.0 ppb (10) 6.0 ppb (6) N/A 4.0 ppb (4) N/A N/A 23.0 ppb (22) N/A N/A 3.0 μg/m3 (13) 22.0
 
Oct. 23, 2021, 4 p.m. 6.0 ppb (6) 4.0 ppb (4) N/A 3.0 ppb (3) N/A N/A 22.0 ppb (21) N/A N/A 3.0 μg/m3 (13) 21.0
 
Oct. 23, 2021, 3 p.m. 8.0 ppb (8) 5.0 ppb (5) N/A 4.0 ppb (4) N/A N/A 21.0 ppb (20) N/A N/A 3.0 μg/m3 (13) 20.0
 
Oct. 23, 2021, 2 p.m. 6.0 ppb (6) 3.0 ppb (3) N/A 3.0 ppb (3) N/A N/A 20.0 ppb (19) N/A N/A 3.0 μg/m3 (13) 19.0
 
Oct. 23, 2021, 1 p.m. 6.0 ppb (6) 3.0 ppb (3) N/A 3.0 ppb (3) N/A N/A 19.0 ppb (18) N/A N/A 3.0 μg/m3 (13) 18.0
 
Oct. 23, 2021, noon 5.0 ppb (5) 3.0 ppb (3) N/A 2.0 ppb (2) N/A N/A 19.0 ppb (18) N/A N/A 3.0 μg/m3 (13) 18.0
 
Oct. 23, 2021, 11 a.m. 7.0 ppb (7) 4.0 ppb (4) N/A 3.0 ppb (3) N/A N/A 17.0 ppb (16) N/A N/A 3.0 μg/m3 (13) 16.0
 
Oct. 23, 2021, 10 a.m. 5.0 ppb (5) 2.0 ppb (2) N/A 2.0 ppb (2) N/A N/A 18.0 ppb (17) N/A N/A 3.0 μg/m3 (13) 17.0
 
Oct. 23, 2021, 9 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 19.0 ppb (18) N/A N/A 3.0 μg/m3 (13) 18.0
 
Oct. 23, 2021, 8 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A N/A N/A N/A 3.0 μg/m3 (13) 13.0
 
Oct. 23, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A 19.0 ppb (18) N/A N/A 3.0 μg/m3 (13) 18.0
 
Oct. 23, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (21) N/A N/A 4.0 μg/m3 (17) 21.0
 
Oct. 23, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A 22.0 ppb (21) N/A N/A 4.0 μg/m3 (17) 21.0
 
Oct. 23, 2021, 4 a.m. 7.0 ppb (7) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A 22.0 ppb (21) N/A N/A 4.0 μg/m3 (17) 21.0
 
Oct. 23, 2021, 3 a.m. 14.0 ppb (14) 3.0 ppb (3) N/A 12.0 ppb (12) N/A N/A 15.0 ppb (14) N/A N/A 4.0 μg/m3 (17) 17.0
 
Oct. 23, 2021, 2 a.m. 7.0 ppb (7) 1.0 ppb (1) N/A 6.0 ppb (6) N/A N/A 22.0 ppb (21) N/A N/A 3.0 μg/m3 (13) 21.0
 
Oct. 23, 2021, 1 a.m. 8.0 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A 23.0 ppb (22) N/A N/A 3.0 μg/m3 (13) 22.0
 
Oct. 23, 2021, midnight 13.0 ppb (13) 5.0 ppb (5) N/A 8.0 ppb (8) N/A N/A 20.0 ppb (19) N/A N/A 3.0 μg/m3 (13) 19.0
 
Oct. 22, 2021, 11 p.m. 7.0 ppb (7) 2.0 ppb (2) N/A 5.0 ppb (5) N/A N/A 21.0 ppb (20) N/A N/A 4.0 μg/m3 (17) 20.0
 
Oct. 22, 2021, 10 p.m. 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A 23.0 ppb (22) N/A N/A 3.0 μg/m3 (13) 22.0
 
Oct. 22, 2021, 9 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 27.0 ppb (25) N/A N/A 3.0 μg/m3 (13) 25.0
 
Oct. 22, 2021, 8 p.m. 9.0 ppb (9) 4.0 ppb (4) N/A 6.0 ppb (6) N/A N/A 28.0 ppb (26) N/A N/A 4.0 μg/m3 (17) 26.0
 
Oct. 22, 2021, 7 p.m. 9.0 ppb (9) 4.0 ppb (4) N/A 6.0 ppb (6) N/A N/A 30.0 ppb (28) N/A N/A 4.0 μg/m3 (17) 28.0
 
Oct. 22, 2021, 6 p.m. 12.0 ppb (12) 5.0 ppb (5) N/A 6.0 ppb (6) N/A N/A 31.0 ppb (29) N/A N/A 4.0 μg/m3 (17) 29.0
 
Oct. 22, 2021, 5 p.m. 20.0 ppb (19) 10.0 ppb (10) N/A 10.0 ppb (10) N/A N/A 30.0 ppb (28) N/A N/A 5.0 μg/m3 (21) 28.0
 
Oct. 22, 2021, 4 p.m. 13.0 ppb (13) 5.0 ppb (5) N/A 8.0 ppb (8) N/A N/A 31.0 ppb (29) N/A N/A 6.0 μg/m3 (25) 29.0
 
Oct. 22, 2021, 3 p.m. 22.0 ppb (21) 10.0 ppb (10) N/A 12.0 ppb (12) N/A N/A 30.0 ppb (28) N/A N/A 8.0 μg/m3 (34) 34.0
 
Oct. 22, 2021, 2 p.m. 25.0 ppb (24) 12.0 ppb (12) N/A 13.0 ppb (13) N/A N/A 27.0 ppb (25) N/A N/A 10.0 μg/m3 (42) 42.0
 
Oct. 22, 2021, 1 p.m. 48.0 ppb (46) 28.0 ppb (27) N/A 20.0 ppb (19) N/A N/A 17.0 ppb (16) N/A N/A 15.0 μg/m3 (58) 58.0
 
Oct. 22, 2021, noon 50.0 ppb (48) 27.0 ppb (26) N/A 24.0 ppb (23) N/A N/A 11.0 ppb (11) N/A N/A 16.0 μg/m3 (60) 60.0
 
Oct. 22, 2021, 11 a.m. 42.0 ppb (40) 17.0 ppb (17) N/A 25.0 ppb (24) N/A N/A 13.0 ppb (13) N/A N/A 16.0 μg/m3 (60) 60.0
 
Oct. 22, 2021, 10 a.m. 36.0 ppb (34) 14.0 ppb (14) N/A 22.0 ppb (21) N/A N/A 18.0 ppb (17) N/A N/A 15.0 μg/m3 (58) 58.0
 
Oct. 22, 2021, 9 a.m. 24.0 ppb (23) 6.0 ppb (6) N/A 18.0 ppb (17) N/A N/A 23.0 ppb (22) N/A N/A 13.0 μg/m3 (53) 53.0
 
Oct. 22, 2021, 8 a.m. 27.0 ppb (26) 7.0 ppb (7) N/A 19.0 ppb (18) N/A N/A 24.0 ppb (23) N/A N/A 12.0 μg/m3 (50) 50.0
 
Oct. 22, 2021, 7 a.m. 20.0 ppb (19) 5.0 ppb (5) N/A 15.0 ppb (15) N/A N/A 29.0 ppb (27) N/A N/A 11.0 μg/m3 (46) 46.0
 
Oct. 22, 2021, 6 a.m. 24.0 ppb (23) 6.0 ppb (6) N/A 18.0 ppb (17) N/A N/A 27.0 ppb (25) N/A N/A 10.0 μg/m3 (42) 42.0
 
Oct. 22, 2021, 5 a.m. 28.0 ppb (27) 6.0 ppb (6) N/A 22.0 ppb (21) N/A N/A 21.0 ppb (20) N/A N/A 9.0 μg/m3 (38) 38.0
 
Oct. 22, 2021, 4 a.m. 32.0 ppb (31) 7.0 ppb (7) N/A 25.0 ppb (24) N/A N/A 21.0 ppb (20) N/A N/A 8.0 μg/m3 (34) 34.0
 
Oct. 22, 2021, 3 a.m. 22.0 ppb (21) 5.0 ppb (5) N/A 17.0 ppb (17) N/A N/A 28.0 ppb (26) N/A N/A 8.0 μg/m3 (34) 34.0
 
Oct. 22, 2021, 2 a.m. 31.0 ppb (30) 7.0 ppb (7) N/A 24.0 ppb (23) N/A N/A 29.0 ppb (27) N/A N/A 8.0 μg/m3 (34) 34.0
 
Oct. 22, 2021, 1 a.m. 24.0 ppb (23) 3.0 ppb (3) N/A 20.0 ppb (19) N/A N/A 33.0 ppb (31) N/A N/A 8.0 μg/m3 (34) 34.0
 
Oct. 22, 2021, midnight 23.0 ppb (22) 4.0 ppb (4) N/A 19.0 ppb (18) N/A N/A 41.0 ppb (38) N/A N/A 8.0 μg/m3 (34) 38.0
 
Oct. 21, 2021, 11 p.m. 32.0 ppb (31) 7.0 ppb (7) N/A 25.0 ppb (24) N/A N/A 33.0 ppb (31) N/A N/A 7.0 μg/m3 (30) 31.0
 
Oct. 21, 2021, 10 p.m. 49.0 ppb (47) 16.0 ppb (16) N/A 33.0 ppb (32) N/A N/A 21.0 ppb (20) N/A N/A 7.0 μg/m3 (30) 47.0
 
Oct. 21, 2021, 9 p.m. 44.0 ppb (42) 14.0 ppb (14) N/A 29.0 ppb (28) N/A N/A 26.0 ppb (25) N/A N/A 7.0 μg/m3 (30) 42.0
 
Oct. 21, 2021, 8 p.m. 45.0 ppb (43) 17.0 ppb (17) N/A 28.0 ppb (27) N/A N/A 30.0 ppb (28) N/A N/A 7.0 μg/m3 (30) 43.0
 
Oct. 21, 2021, 7 p.m. N/A N/A N/A N/A N/A N/A N/A N/A N/A 6.0 μg/m3 (25) 25.0
 
Oct. 21, 2021, 6 p.m. 39.0 ppb (37) 15.0 ppb (15) N/A 24.0 ppb (23) N/A N/A 35.0 ppb (33) N/A N/A N/A 37.0
 
Oct. 21, 2021, 5 p.m. 32.0 ppb (31) 12.0 ppb (12) N/A 21.0 ppb (20) N/A N/A 38.0 ppb (36) N/A N/A 7.0 μg/m3 (30) 36.0
 
Oct. 21, 2021, 4 p.m. 40.0 ppb (38) 17.0 ppb (17) N/A 22.0 ppb (21) N/A N/A 31.0 ppb (29) N/A N/A 7.0 μg/m3 (30) 38.0
 
Oct. 21, 2021, 3 p.m. 46.0 ppb (44) 22.0 ppb (21) N/A 24.0 ppb (23) N/A N/A 25.0 ppb (24) N/A N/A 7.0 μg/m3 (30) 44.0
 
Oct. 21, 2021, 2 p.m. 45.0 ppb (43) 21.0 ppb (20) N/A 24.0 ppb (23) N/A N/A 24.0 ppb (23) N/A N/A 7.0 μg/m3 (30) 43.0
 
Oct. 21, 2021, 1 p.m. 29.0 ppb (28) 11.0 ppb (11) N/A 18.0 ppb (17) N/A N/A 15.0 ppb (14) N/A N/A 7.0 μg/m3 (30) 30.0
 
Oct. 21, 2021, noon 57.0 ppb (55) 29.0 ppb (28) N/A 28.0 ppb (27) N/A N/A 6.0 ppb (6) N/A N/A 7.0 μg/m3 (30) 55.0
 
Oct. 21, 2021, 11 a.m. 56.0 ppb (54) 28.0 ppb (27) N/A 27.0 ppb (26) N/A N/A 1.0 ppb (1) N/A N/A 7.0 μg/m3 (30) 54.0
 
Oct. 21, 2021, 10 a.m. 54.0 ppb (51) 23.0 ppb (22) N/A 31.0 ppb (30) N/A N/A 1.0 ppb (1) N/A N/A 7.0 μg/m3 (30) 51.0
 
Oct. 21, 2021, 9 a.m. 81.0 ppb (80) 47.0 ppb (45) N/A 34.0 ppb (33) N/A N/A 1.0 ppb (1) N/A N/A 7.0 μg/m3 (30) 80.0
 
Oct. 21, 2021, 8 a.m. 83.0 ppb (82) 46.0 ppb (44) N/A 37.0 ppb (35) N/A N/A 1.0 ppb (1) N/A N/A 6.0 μg/m3 (25) 82.0
 
Oct. 21, 2021, 7 a.m. 69.0 ppb (67) 31.0 ppb (30) N/A 38.0 ppb (36) N/A N/A 5.0 ppb (5) N/A N/A 6.0 μg/m3 (25) 67.0
 
Oct. 21, 2021, 6 a.m. 9.0 ppb (9) 1.0 ppb (1) N/A 9.0 ppb (9) N/A N/A 37.0 ppb (35) N/A N/A 6.0 μg/m3 (25) 35.0
 
Oct. 21, 2021, 5 a.m. 29.0 ppb (28) 7.0 ppb (7) N/A 22.0 ppb (21) N/A N/A 20.0 ppb (19) N/A N/A 7.0 μg/m3 (30) 30.0
 
Oct. 21, 2021, 4 a.m. 49.0 ppb (47) 18.0 ppb (17) N/A 31.0 ppb (30) N/A N/A 4.0 ppb (4) N/A N/A 7.0 μg/m3 (30) 47.0
 
Oct. 21, 2021, 3 a.m. 54.0 ppb (51) 29.0 ppb (28) N/A 24.0 ppb (23) N/A N/A 3.0 ppb (3) N/A N/A 8.0 μg/m3 (34) 51.0
 
Oct. 21, 2021, 2 a.m. 47.0 ppb (45) 25.0 ppb (24) N/A 22.0 ppb (21) N/A N/A 2.0 ppb (2) N/A N/A 9.0 μg/m3 (38) 45.0
 
Oct. 21, 2021, 1 a.m. 28.0 ppb (27) 7.0 ppb (7) N/A 21.0 ppb (20) N/A N/A 8.0 ppb (8) N/A N/A 10.0 μg/m3 (42) 42.0
 
Oct. 21, 2021, midnight 34.0 ppb (33) 11.0 ppb (11) N/A 23.0 ppb (22) N/A N/A 11.0 ppb (11) N/A N/A 9.0 μg/m3 (38) 38.0
 
Oct. 20, 2021, 11 p.m. 41.0 ppb (39) 17.0 ppb (17) N/A 24.0 ppb (23) N/A N/A 8.0 ppb (8) N/A N/A 10.0 μg/m3 (42) 42.0
 
Oct. 20, 2021, 10 p.m. 68.0 ppb (66) 37.0 ppb (35) N/A 31.0 ppb (30) N/A N/A 3.0 ppb (3) N/A N/A 9.0 μg/m3 (38) 66.0
 
Oct. 20, 2021, 9 p.m. 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A 35.0 ppb (33) N/A N/A 7.0 μg/m3 (30) 33.0
 
Oct. 20, 2021, 8 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 36.0 ppb (34) N/A N/A 6.0 μg/m3 (25) 34.0
 
Oct. 20, 2021, 7 p.m. 8.0 ppb (8) 3.0 ppb (3) N/A 5.0 ppb (5) N/A N/A 36.0 ppb (34) N/A N/A 6.0 μg/m3 (25) 34.0
 
Oct. 20, 2021, 6 p.m. 11.0 ppb (11) 5.0 ppb (5) N/A 7.0 ppb (7) N/A N/A 34.0 ppb (32) N/A N/A 6.0 μg/m3 (25) 32.0
 
Oct. 20, 2021, 5 p.m. 14.0 ppb (14) 7.0 ppb (7) N/A 8.0 ppb (8) N/A N/A 32.0 ppb (30) N/A N/A 5.0 μg/m3 (21) 30.0
 
Oct. 20, 2021, 4 p.m. 12.0 ppb (12) 6.0 ppb (6) N/A 6.0 ppb (6) N/A N/A 32.0 ppb (30) N/A N/A 5.0 μg/m3 (21) 30.0
 
Oct. 20, 2021, 3 p.m. 14.0 ppb (14) 7.0 ppb (7) N/A 7.0 ppb (7) N/A N/A 30.0 ppb (28) N/A N/A 6.0 μg/m3 (25) 28.0
 
Oct. 20, 2021, 2 p.m. 19.0 ppb (18) 9.0 ppb (9) N/A 10.0 ppb (10) N/A N/A 28.0 ppb (26) N/A N/A 6.0 μg/m3 (25) 26.0
 
Oct. 20, 2021, 1 p.m. 20.0 ppb (19) 10.0 ppb (10) N/A 10.0 ppb (10) N/A N/A 23.0 ppb (22) N/A N/A 6.0 μg/m3 (25) 25.0
 
Oct. 20, 2021, noon 45.0 ppb (43) 23.0 ppb (22) N/A 22.0 ppb (21) N/A N/A 11.0 ppb (11) N/A N/A 6.0 μg/m3 (25) 43.0
 
Oct. 20, 2021, 11 a.m. 45.0 ppb (43) 20.0 ppb (19) N/A 25.0 ppb (24) N/A N/A 4.0 ppb (4) N/A N/A 6.0 μg/m3 (25) 43.0
 
Oct. 20, 2021, 10 a.m. 69.0 ppb (67) 40.0 ppb (38) N/A 29.0 ppb (28) N/A N/A 1.0 ppb (1) N/A N/A 6.0 μg/m3 (25) 67.0
 
Oct. 20, 2021, 9 a.m. 49.0 ppb (47) 26.0 ppb (25) N/A 23.0 ppb (22) N/A N/A 1.0 ppb (1) N/A N/A 5.0 μg/m3 (21) 47.0
 
Oct. 20, 2021, 8 a.m. 16.0 ppb (16) 3.0 ppb (3) N/A 13.0 ppb (13) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
Oct. 20, 2021, 7 a.m. N/A N/A N/A N/A N/A N/A 11.0 ppb (11) N/A N/A 5.0 μg/m3 (21) 21.0
 
Oct. 20, 2021, 6 a.m. N/A N/A N/A N/A N/A N/A 7.0 ppb (7) N/A N/A 5.0 μg/m3 (21) 21.0
 
Oct. 20, 2021, 5 a.m. N/A N/A N/A N/A N/A N/A 5.0 ppb (5) N/A N/A 5.0 μg/m3 (21) 21.0
 
Oct. 20, 2021, 4 a.m. 30.0 ppb (29) 11.0 ppb (11) N/A 19.0 ppb (18) N/A N/A 7.0 ppb (7) N/A N/A 5.0 μg/m3 (21) 29.0
 
Oct. 20, 2021, 3 a.m. 28.0 ppb (27) 9.0 ppb (9) N/A 19.0 ppb (18) N/A N/A 6.0 ppb (6) N/A N/A 5.0 μg/m3 (21) 27.0
 
Oct. 20, 2021, 2 a.m. 38.0 ppb (36) 16.0 ppb (16) N/A 22.0 ppb (21) N/A N/A 3.0 ppb (3) N/A N/A 4.0 μg/m3 (17) 36.0
 
Oct. 20, 2021, 1 a.m. 50.0 ppb (48) 28.0 ppb (27) N/A 23.0 ppb (22) N/A N/A 6.0 ppb (6) N/A N/A 4.0 μg/m3 (17) 48.0
 
Oct. 20, 2021, midnight 52.0 ppb (50) 28.0 ppb (27) N/A 25.0 ppb (24) N/A N/A 6.0 ppb (6) N/A N/A 4.0 μg/m3 (17) 50.0
 
Oct. 19, 2021, 11 p.m. 11.0 ppb (11) 3.0 ppb (3) N/A 8.0 ppb (8) N/A N/A 26.0 ppb (25) N/A N/A 3.0 μg/m3 (13) 25.0
 
Oct. 19, 2021, 10 p.m. 9.0 ppb (9) 2.0 ppb (2) N/A 7.0 ppb (7) N/A N/A 27.0 ppb (25) N/A N/A 3.0 μg/m3 (13) 25.0
 
Oct. 19, 2021, 9 p.m. 11.0 ppb (11) 3.0 ppb (3) N/A 8.0 ppb (8) N/A N/A 29.0 ppb (27) N/A N/A 3.0 μg/m3 (13) 27.0
 
Oct. 19, 2021, 8 p.m. 9.0 ppb (9) 4.0 ppb (4) N/A 5.0 ppb (5) N/A N/A 32.0 ppb (30) N/A N/A 3.0 μg/m3 (13) 30.0
 
Oct. 19, 2021, 7 p.m. 12.0 ppb (12) 6.0 ppb (6) N/A 6.0 ppb (6) N/A N/A 31.0 ppb (29) N/A N/A 3.0 μg/m3 (13) 29.0
 
Oct. 19, 2021, 6 p.m. 11.0 ppb (11) 5.0 ppb (5) N/A 6.0 ppb (6) N/A N/A 31.0 ppb (29) N/A N/A 2.0 μg/m3 (9) 29.0
 
Oct. 19, 2021, 5 p.m. 13.0 ppb (13) 7.0 ppb (7) N/A 6.0 ppb (6) N/A N/A 28.0 ppb (26) N/A N/A 2.0 μg/m3 (9) 26.0
 
Oct. 19, 2021, 4 p.m. 11.0 ppb (11) 7.0 ppb (7) N/A 5.0 ppb (5) N/A N/A 25.0 ppb (24) N/A N/A 2.0 μg/m3 (9) 24.0
 
Oct. 19, 2021, 3 p.m. 13.0 ppb (13) 8.0 ppb (8) N/A 5.0 ppb (5) N/A N/A 21.0 ppb (20) N/A N/A 2.0 μg/m3 (9) 20.0
 
Oct. 19, 2021, 2 p.m. 13.0 ppb (13) 8.0 ppb (8) N/A 5.0 ppb (5) N/A N/A 20.0 ppb (19) N/A N/A 2.0 μg/m3 (9) 19.0
 
Oct. 19, 2021, 1 p.m. 19.0 ppb (18) 13.0 ppb (13) N/A 6.0 ppb (6) N/A N/A 15.0 ppb (14) N/A N/A 2.0 μg/m3 (9) 18.0
 
Oct. 19, 2021, noon 18.0 ppb (17) 11.0 ppb (11) N/A 7.0 ppb (7) N/A N/A 10.0 ppb (10) N/A N/A 2.0 μg/m3 (9) 17.0
 
Oct. 19, 2021, 11 a.m. 40.0 ppb (38) 27.0 ppb (26) N/A 12.0 ppb (12) N/A N/A 3.0 ppb (3) N/A N/A 3.0 μg/m3 (13) 38.0
 
Oct. 19, 2021, 10 a.m. 19.0 ppb (18) 10.0 ppb (10) N/A 9.0 ppb (9) N/A N/A 5.0 ppb (5) N/A N/A 2.0 μg/m3 (9) 18.0
 
Oct. 19, 2021, 9 a.m. 11.0 ppb (11) 6.0 ppb (6) N/A 5.0 ppb (5) N/A N/A 10.0 ppb (10) N/A N/A 2.0 μg/m3 (9) 11.0
 
Oct. 19, 2021, 8 a.m. 10.0 ppb (10) 5.0 ppb (5) N/A 5.0 ppb (5) N/A N/A 10.0 ppb (10) N/A N/A 2.0 μg/m3 (9) 10.0
 
Oct. 19, 2021, 7 a.m. 23.0 ppb (22) 15.0 ppb (15) N/A 8.0 ppb (8) N/A N/A 8.0 ppb (8) N/A N/A 2.0 μg/m3 (9) 22.0
 
Oct. 19, 2021, 6 a.m. 17.0 ppb (17) 7.0 ppb (7) N/A 10.0 ppb (10) N/A N/A 4.0 ppb (4) N/A N/A 2.0 μg/m3 (9) 17.0
 
Oct. 19, 2021, 5 a.m. 12.0 ppb (12) 7.0 ppb (7) N/A 5.0 ppb (5) N/A N/A 10.0 ppb (10) N/A N/A 2.0 μg/m3 (9) 12.0
 
Oct. 19, 2021, 4 a.m. 6.0 ppb (6) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 12.0 ppb (12) N/A N/A 2.0 μg/m3 (9) 12.0
 
Oct. 19, 2021, 3 a.m. 14.0 ppb (14) 8.0 ppb (8) N/A 6.0 ppb (6) N/A N/A 10.0 ppb (10) N/A N/A 3.0 μg/m3 (13) 14.0
 
Oct. 19, 2021, 2 a.m. 17.0 ppb (17) 9.0 ppb (9) N/A 7.0 ppb (7) N/A N/A 10.0 ppb (10) N/A N/A 3.0 μg/m3 (13) 17.0
 
Oct. 19, 2021, 1 a.m. 13.0 ppb (13) 7.0 ppb (7) N/A 6.0 ppb (6) N/A N/A 11.0 ppb (11) N/A N/A 3.0 μg/m3 (13) 13.0
 
Oct. 19, 2021, midnight 12.0 ppb (12) 7.0 ppb (7) N/A 5.0 ppb (5) N/A N/A 15.0 ppb (14) N/A N/A 3.0 μg/m3 (13) 14.0
 
Oct. 18, 2021, 11 p.m. 20.0 ppb (19) 12.0 ppb (12) N/A 8.0 ppb (8) N/A N/A 17.0 ppb (16) N/A N/A 3.0 μg/m3 (13) 19.0
 
Oct. 18, 2021, 10 p.m. 13.0 ppb (13) 6.0 ppb (6) N/A 6.0 ppb (6) N/A N/A 19.0 ppb (18) N/A N/A 3.0 μg/m3 (13) 18.0
 
Oct. 18, 2021, 9 p.m. 10.0 ppb (10) 5.0 ppb (5) N/A 5.0 ppb (5) N/A N/A 22.0 ppb (21) N/A N/A 2.0 μg/m3 (9) 21.0
 
Oct. 18, 2021, 8 p.m. 10.0 ppb (10) 5.0 ppb (5) N/A 5.0 ppb (5) N/A N/A 23.0 ppb (22) N/A N/A 2.0 μg/m3 (9) 22.0
 
Oct. 18, 2021, 7 p.m. 14.0 ppb (14) 8.0 ppb (8) N/A 6.0 ppb (6) N/A N/A 23.0 ppb (22) N/A N/A 2.0 μg/m3 (9) 22.0
 
Oct. 18, 2021, 6 p.m. 16.0 ppb (16) 10.0 ppb (10) N/A 6.0 ppb (6) N/A N/A 25.0 ppb (24) N/A N/A 2.0 μg/m3 (9) 24.0
 
Oct. 18, 2021, 5 p.m. 10.0 ppb (10) 6.0 ppb (6) N/A 4.0 ppb (4) N/A N/A 26.0 ppb (25) N/A N/A 2.0 μg/m3 (9) 25.0
 
Oct. 18, 2021, 4 p.m. 12.0 ppb (12) 7.0 ppb (7) N/A 5.0 ppb (5) N/A N/A 23.0 ppb (22) N/A N/A 2.0 μg/m3 (9) 22.0
 
Oct. 18, 2021, 3 p.m. 11.0 ppb (11) 7.0 ppb (7) N/A 4.0 ppb (4) N/A N/A 22.0 ppb (21) N/A N/A 2.0 μg/m3 (9) 21.0
 
Oct. 18, 2021, 2 p.m. 13.0 ppb (13) 8.0 ppb (8) N/A 5.0 ppb (5) N/A N/A 23.0 ppb (22) N/A N/A 3.0 μg/m3 (13) 22.0
 
Oct. 18, 2021, 1 p.m. 11.0 ppb (11) 6.0 ppb (6) N/A 4.0 ppb (4) N/A N/A 22.0 ppb (21) N/A N/A 3.0 μg/m3 (13) 21.0
 
Oct. 18, 2021, noon 15.0 ppb (15) 8.0 ppb (8) N/A 7.0 ppb (7) N/A N/A 19.0 ppb (18) N/A N/A 3.0 μg/m3 (13) 18.0
 
Oct. 18, 2021, 11 a.m. 16.0 ppb (16) 8.0 ppb (8) N/A 9.0 ppb (9) N/A N/A 13.0 ppb (13) N/A N/A 2.0 μg/m3 (9) 16.0
 
Oct. 18, 2021, 10 a.m. 14.0 ppb (14) 8.0 ppb (8) N/A 6.0 ppb (6) N/A N/A 12.0 ppb (12) N/A N/A 2.0 μg/m3 (9) 14.0